Forum websites are online discussion sites or as it were, ‘message board’. Forum Posting essentially implies posting new strings or answering to old ones in forums with a specific end goal to get quality inbound backlinks to a site. In the event that Forum Posting is done the correct way then it can drive focused on activity to a site.
Go through this forum submission sites list and register on them with your correct details. Once you register you can reply to old threads and post your questions.