How to change permission in file system

I want to install nodogsplash in openwrt. I use Tp link wr841N but when i install, i have error read only file system in folder usr. How i can change permission in this folder. Pls help me

I use command opkg install nodogsplash
and this is error:
image

You would be best off explaining exactly how you are installing nodogsplash and copying the exact error from your screen. You should also post the output of mount and of df -h

Considering that the TP-Link WR841N units fall under the 4/32 warning

Devices with ≤4MB flash and/or ≤32MB ram suffer from limitations in usability, extensibility and stability of operation. Consider this when choosing a device to buy, or when deciding to flash OpenWrt on your device because it is listed as supported. See 432_warning for details.

it is quite possible that you can't install it as you don't have enough flash.

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I use command opkg install nodogsplash
and this is error:
image

How about the other commands that @jeff mentioned? mount and df -h