Hi.
The plastic casing suronding the smaller end of the scart adaptor (the part that plugs into the TV) has a plastic bit you can press in and it releases it from the tv, if this does not work you can remove the plastic casing by unclipping it and you will see two small square bits of metal attached to the metal 'plug' part of the scart adaptor, these can be pushed in to release it (i suggest you use a screwdriver or something to do this, if you try to push them in by hand you will probably end up with a bleeding finger .........trust me!)
Hope this helps
Scotty
March 2011