as far as i know, campaigns are not accepting newbies anymore, you really have to become a jr member first so that you can join campaigns.

I think, you should read the rules and regulations first and be familiarize with it. to avoid spamming, you shoud post constructive and relevant to the topic. avoid short and irrelevant posts and as long as you can, write your original post and do not copy it from other's post.

yes, the other members of the forum may give you a merit once you have convinced them of your post. your post should have a good quality and will be really helpful and informative to other members. so i advice you to read and research so that you can share your knowledge in the forum. you should also avoid irrelevant posts so that you will not be banned. also, you should not ask for merits because it is one of the rules that you should not beg. merits will be sent to you if you deserve to have one.

it is not about how many times you post a day, for you to have a merit, you should post a useful, constructive and relevant topic. when the other member notice that your post is good quality and useful, they can give you merit. I advice you to read, learn and share your knowledge and do not focus on how many post you can do but to focus with the knowledge you are sharing.