Hi! It's me again now i having a problem that i don't want new members with no post to log in to Categories/forum. I mean if a new member with over 1 post or more than that value, they can go to the "forum" and see topics. And new members with 0 post, they can't log in to the "forum" to see topics.

Ex. I post a topic name "abcxyz" in forum called "Joke" and i want members who archive higher than 2 posts to go to "Joke", and members are under 2 posts can't go to "Joke" to see "abcxyz".

You can use the auto subscribe groups https://help.forumotion.com/t57913-auto-subscribe-to-groups

By using the tutorial provided to you by MrMario, you can combine the effect with this: https://help.forumotion.com/t38399-restricted-forums

...to create a restricted forum.