by forum active, it means you MUST post on our clan thread, not just check it, the forum activity (well, the clan thread activity) is needed, you must post either way you get kicked for inactivity, and that's it, but well, the first week you have to be active, you will be a "unranked" ("New members" rank) for a week, if we see you can do it, then you will become a fully member, so, try to post, know more our members, talk with us, join the IRC sometimes, and let's see what happens.
btw that's what i was talking about: "("copy and paste this if you've readed the rules" on the final of your application)"
It's on the rules, check it out.