Edit. My answer immediately below is incorrect. See OzarkEdge's answer following it for the correct answer.
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None of the OBi devices has a record facility; there is no record button anywhere on thr portal or the local web interface.
The default login name and password for the web GUI on the device are admin and admin. You can see the password on the Obitalk portal. The device password is separate from your Obitalk or Google one.
Perhaps GV has a recording facility. If so it would be available via
google.com/voice.Or are you referring to 'Call History'? That holds details of the last 200 calls in or out. Available only on the local web interface. Once logged in, click on' Status' at top of the list on the left hand side. (Call History is the only noteworthy feature I recall not being available via 'Expert' on the Obitalk portal.)