How to set up model zbt-we826-t

Installing and Using OpenWrt Network and Wireless Configuration
1

So I'm gaming on my PS4 .I had addeda line on my T-Mobile account. Put SIM in but this is confusing lol different than my last 4g router. Does it have to be unlocked to work? And how do I enable my TTL settings I want to change it to show my tethered data as streaming