I searched through Adsense help forum but I could not find any answer for this question. Can anyone guide me on this?
Just be sure the users being paid for posting are not also encouraged to click ads while they're there.
I see no problem having a forum that pays people. Just absolutely no incentive for clicking on the ads anywhere at all.
Just follow TOS and you can place your ads in a forum. Just be mindful of others and use Google Analytics to analyze where your major sources of organic traffic is coming from
Yes, without hesitation you can use the account but be careful not to break terms and conditions of Google adsense.