Been down & had a play, there is a high level menu which you can scroll left & right using A or B, then once you see the option you want you hold B for 2 seconds, which takes you into the sub-menu, the using A & B to go left & right again & B to go into lower menu. Pressing A for 2 seconds brings you backup a level.
Under the Heading INFO there is an option to JOIN pressing it searched for a HAN which I think is their network for the meters, it then joined, so have to wait an hour or so to see it appears on their website.
it may not been seen on their website until tmrw.......have you rang octopus to ask for a reset on their end. That's what i did and it was up and running within a few minutes from their end