You can try the online form - but it probably won't work. Most people have problems with it. If you find it doesn't work, then only way you can have the adult block removed, is to ask an Agent to do it for you (you cannot get the block lifted at an O2 store - despite what others' might tell you).
Alas, the Agents can be pretty sluggish at actually removing the block, despite the "5 Day" expected removal time they'll mention in their response to you.
If you find you're having problems getting the agents to lift the block (after a reasonable waiting time - 5 days or so), then start asking the educators to nudge the agents for you. It might require several attempts by the educators, but eventually it'll happen. It took them 3 weeks in total to lift my block, that was after two agent requests and 3 educators helping out.
By the way, this post would have been more appropriate in the "ask the community" section.
It would help if the adult block only worked on the sites it is supposed to. Then most people would not need to get it removed.
yes i agree!!!! this forum software is a joke i cant even quote a post for christ sake.
erm... my quote of your post would suggest that you're the problem and not the forum's software, in this respect.