How i can find my own threads because (when) i have written it many
times ago ..?

you cant see your latest thread(i think we cant)
i think GM know it
just PM admins and ask them

okey... i dont know how i can ask a GM

just PM them "can you tell me the latest thread i make?"
PM=private mesage
i think it would help

No I think the most of the GM's would not answer, because they are busy doing random stuff, but you can always try