Business VoiceEdge paging from Polycom 250 phones

I'm having some issues with our Business VoiceEdge setup. I'm trying to set up paging within our office.

I found the Paging settings in MyAccount and turned on for my users, and then set up a paging group.

What I can't find is how to access the feature from our phones. We're using Polycom vvx250's, mostly.

I saw online that I might have to go into each phone's settings to enable Paging/PTT config, but it's behind an admin passcode, which we don't have. (home-settings-advanced [passcode?] - Paging/PTT Config - Paging config - Group paging - Enable - Save) Or at least that's what I found on the forums after much searching.

Thanks in advance,
Matthew