how do i talk to s.o. offering a game?

@DuMussDieUhrDruecken
You can send them a DM or simply use the challenge function.

yeh, but all I can do from an offer is to click it which will accept. (it's on mobile)

The same way you talk to s.o. who is not offering a game. Pick up a telephone. Write a letter. Send a telegram. Go to their house.

done √

...

I have found out:
I changed view to 'diagram' (from 'list') - then holding an offer-symbol will pop-up the details plus clickable nick (then chat).

[thread can be removed from my part]