This is the requirements for the regular level. I have done all of them, and I have been on the forum for 100 days, and I should have it, as my flags have "run out" in 100 days, or in the next 2 days or so.
In the last 100 days...
must have visited at least 50% of days
must have replied to at least 10 different topics
of topics created in the last 100 days, must have viewed 25%
of posts created in the last 100 days, must have read 25%
must have received 20 likes, and given 30 likes.*
must not have received more than 5 spam or offensive flags (with unique posts and unique users for each, confirmed by a moderator)
must not have been suspended.