DNS name behind mikrotik firewall

Dear Guys,

I try to install jitsi behind a mikortik firewall.
I understood that I need to set up on the jitsi server the DNS name into the hosts file.
Need to add the mikrotik router WAN side IP address here and the dns name which is tergeted to this IP?
I understood that I will need forwarding ports on the mikrotik.

Any help appreciated.