Hello and welcome to the forum,
I'm not sure why there was wait time for you to post. Sorry about that. I assumed upon registration the ability to post was instant. I can only speculate but it might be in relation to spammers/trolls recently (not sure though) and that's why there was a wait time. If Mabsoot sees this thread he might have more information but I will try to let him know in case he is not aware of a potential problem. Apologies once again.
As-salaamu'alaykum,
Nice to see you posting brother. I hope all is well, Insha'Allah. I don't think the wait time (if in place) to post is the only reason. A couple of other new users posted within a few days of their join date so I'm not sure if there is a wait time.