How to switch to SIM 2 in Google Messenger?

[Makm]

I use two sims in my phone and I use google messenger as my daily sms app. It receives smses of both the sims, but it uses only sim 1 to send all my messages. How do i switch to sim 2 for sending messages in gm?

 

[Makm]

Huh, it seems like nobody uses google messenger in their dual sim phone here!