How to fix polycarbonate roof

[SpottyBumPony]

One of the polycarbonate sheets in my 'conservatory' is dropping out of the jointing strip. I need to try and fix it but I dont know how to start or what to Google!

It just me, I can ask my DM to hold a ladder for me but I need to do the work.

Help!

for google use : fix slipped polycarbonate conservatory roof panel
or watch youtube videos on how to remove and refit conservatory roof panels

Photo would help us advise