Hello ron54 I just did a search on The Tribby forum and it looks like it's the flap on the rear of the driver's seat base which needs opening to access the fuse board.
I would use the contact us button top left on
www.tribby.co.uk home page to explain you have tried to join the forum but had no reply. Jeff who runs the site gets a lot of spam attacks so vets each email address for new members. Sounds like yours application may have got lost in the process. It,s a great forum (as is this one) and well worth joining