How to setup DIDforsale trunk with new setup freepbx lastest version?

I have search for setup on the DIDforsale website.

and it told me to edit the file sip.conf , but on the latest version it say do not edit this file instead it auto create from the web gui. So my question is how do I add this to freepbx. do I login to the portal and do a add trunk? How do I enter the information below through the web gui> please advise.

STEP-3 How to Configure YOUR Asterisk with DIDForSale?
Add the code below to your ‘sip.conf ‘ file
[didforsale_did]
type=peer
host=[IP ADDRESS OF OUR SERVER]
nat=yes
canreinvite=no
disallow=all
allow=ulaw
allow=alaw
dtmfmode=rfc2833
insecure=very
context=from-didforsale

You need to login to GUI and add new SIP Trunk under Connectivity -> Trunks.
Add appropriate details and add above details under PEER Details field of the trunk.
You may need username / password and registration string to register your SIP trunk with your service provider.
You can verify whether the SIP trunk is up or not by running below command from within Asterisk CLI option from FreePBX GUI or Asterisk CLI itselft:
sip show peers

I’m in the Connectivity -> Trunks -> Add Trunks. Which one should I pick? Add SIP (chan_pjsip) trunk or Add SIP (chan_sip) trunk?

Select Add SIP (chan_sip) trunk