Can I use the GUI to register a trunk?

I just want to register a Sipgate trunk on a new install of AsteriskNow but can’t find anywhere in the GUI?

I am happy to edit the files manually but login as root seems to be a no no. Should I be editing the files via the admin login if so, how?

Any help appreciated and sorry if it has all been answered but all I can find is this forum is a bunch of messages answered with “this has all been answered here before” but no hint as to where.

Hey man, you should register sip trunks in the /etc/asterisk/sip.conf file…

… or in users.conf, examples were posted here