Fr4g D3mon said:
It means that there's a fundamental difference between messengers and forums.
Forums are grouped topics of items, in which just about everyone who is registered can make post their comments, solutions or opinions. Everyone can read these posts as well.
To keep things organised, each forum is divided in subforums with their own subject, and each subforum is - once again - divided in threads. All divisions are by subject, and the best way to read forums is to keep threads (more or less) on topic. If you want to discuss something else, please do so in the appropriate thread, or make a new one. Not only is it easier for everyone, it's also much more likely that your post will be read by someone who can help you.
Another fundamental difference is the time it takes to read and write posts (much slower than messengers). For this reason, you can take your time to write out your posts, and make sure everything is added that you want to add (you never know how much time it'll take until someone will reply).
It's also expected that you read all answered posts; it's rude (to say the least) to ask for something that is already mentioned.
But since you're new, we're gonna cut you some slack. Welcome to BeyondUnreal