I want to setup geust wifi on my tplink router archer c7 ac1750
but after following this guide it is not working
https://openwrt.org/docs/guide-user/network/wifi/guestwifi/guest-wlan#multiple_network_devices
please help
I am afraid that "after following this guide it is not working" is not very helpful... Please, explain your current infrastructure (do you have "multiple network devices"?), post your config files here, tell us what tests you performed and what happened, etc.
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okay i am sorry.
I have three routers in my home. tplink archer c7 v1 is main router with OpenWrt 19.07.2.
other two routers are connected as slave via ethernet cables. they are working fine with stock tplink firmware without any changes.
After following this guide wifi is setup and it is shown. But when i connect with it i get no ip address.
I am noob in openwrt. Please tell me what config files i need to post. and what kind of information i better hide for privacy in these config files.
I'm no expert either, but I think you should probable start with the output of uci export wireless, uci export network and uci export dhcp. You should also probably post the system log you have right after trying to connect and getting no IP address, maybe dnsmasq is spamming it. Preferably while the router isn't doing much else.
I can't tell you what information to hide in those files, but things like the SSID's, wireless passwords, mac-addresses and IP addresses come to mind. Don't remove them, just change them. You'll want to keep the country code if set.
It could be that since this is a guest network, the experts will ask for uci export firewall as well (especially if you isolated it), and they will want to know the IP addresses you use in order to know if there are any conflicts there (meaning you shouldn't change or hide those).
You say you are a noob with OpenWRT. How are you with advanced networking concepts? You are linking to the VLAN section after all. After 20+ years in IT, I still can't those to work at home. 
Perhaps you should start by unhooking the two extra access points and testing the guest network only on your main OpenWRT router? If that works, backup the config and add the other routers and config into mix.
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yes i am setting up guest WiFi on openwrt main router with already running WiFi on it. Just wanted to setup separate WiFi for people when they visit instead of sharing home wifi connections.
With default tplink firmware there was easy setup for geust wifi with speed limit. On openwrt It is little bit difficult to setup.
I was using tplink default firmware but there was issue of high pings when other people start using internet or watch YouTube, Netflix etc. Someone recommended me to use openwrt with SQM. I started using openwrt and slowly did different settings. And i have already setup SQM it is like magic other people can watch YouTube etc no high pings or lag for me in games anymore. But after using openwrt with SQM i never want to go back default tplink firmware.I want to setup guest WiFi same as tplink default firmware with speed limits. And I dont know why it is difficult to setup guest WiFi with openwrt. Maybe they can add settings for it in GUI?
here is the link for tplink archer c7 emulator
it is very easy to setup
I actually have a C7 lying around, I used it to test my latest configuration on before putting it on my main router. Obviously it is running OpenWRT too.
A basic extra WiFi SSID is not that hard, I created one for my smart-home devices in 10 seconds.
As a matter of fact, they have a Luci page for it. That should configure a guest network with isolation.
When you add in guest isolation (making sure that your guest cannot reach your own network, only the Internet), separate IP subnets and extra devices with VLANs, it gets a bit more complicated. A reason why people choose OpenWRT is for its enterprise-features. That can have some consequences. I know somebody that took it even further and implemented pfSense so he can give out time-based access to his guests. Still not that hard if you really take the time to study it.
That said, I do believe there are some Luci instructions for VLANs in the page you linked to. And I don't quite see why they are needed. My guess is for isolation purposes.
If it truly gets too difficult, you can always see if your router supports DD-WRT (am I allowed to say that name here?). It's sort of a bridge between stock firmware and the versatility of OpenWRT. You do pretty much everything in the GUI.