Hi!
I can't post anything, it says I have posted one in the last 360 seconds, but I didn't.

Hi and welcome to the forum! That is strange I can see you have not posted to get that message, I only have one idea and that could be because you are using the tor browser, are you using tor? If not start a thread in the meta section and admin or staff maybe able to help. You was getting that message but managed to post this thread? lol
Tor has nothing to do with this.
The time you have to wait gets reset for certain activites such as:
- log in
- searching
- reporting to a moderator
- sending a PM
- posting