Sip trunks - zadarma

I try use zadarma sip on trunk but not work. how can i solve the problem?

Set trunk to peer mode.

how to change to peer mode?

Humm it seems, you are newbies, better to look someone at your side could help or use internet search engine, can find information as;(FreePBX PJSIP setup instructions (zadarma.com) ).

good luck.