How to use radio? Chat limited to channel only?

[Allah macht frei]

How to know which channel to use; is there any route diagram, or/and see via trackside signs showing radio channel? And radiostop, ZEW1-2-3

And is chat limited to radio? I tried to contact dispatch but no response. Even via voicechat, no luck. At Lazy Lc while waiting for signal another driver on regional stopper service stopped, we both left cab and greeted eachother with jump and etc but appearingly he didn't see my "hello", "sup" chat.

Edited December 12, 2022 by Allah macht frei