Can't you ask those questions to your campaign manager? It really depends from campaign to campaign.
1. How to know the number of participants who joined the campaign?
a. Check the campaign spreadsheets (most of them have one).
b. Ask in the thread?
2. How will I know if the post I made is counted for the valid post? How do campaign manegers evaluate the post you made? I really love to know how do they evaluate it to make it an valid post.
Read the campaign rules. It's not hard! You should try.
Your campaign for example:
- Posts made in the following sections will not be counted as valid posts: Local Boards, Marketplace; Off-topic; Archival; Marketplace (Altcoins).
- Posts with less than 80 characters will not be counted as valid posts.
You should know that before applying.
