gb2 is done via the profile.
find your guy you want to repair at, click him, click "target info" in hb.
add that to the <Vendors> </Vendors> in the profile. click save.
for mailboxes, you go up to a mailbox, click my position, copy / paste that into your profile, change Hotspot to Mailbox and you're done
This has been said *many* times, and I have even written a guide in HB2 grinding profiles (grinding profiles have the same vendor / mailbox / hotspots as gb2 profiles)
please use the search function if you're in a hurry