https://bitcointalk.org/index.php?topic=178608.0- Newbie: No styling (including links) allowed. Max 50 characters.
- Jr. Member: Links allowed. Max 150 characters.
- Member: Unlimited length.
- Full: Color allowed.
- Sr. Member: Size allowed
- Hero: Background color allowed
It takes you 30 activity.
The first 2 week period you posted in was from 7th to 21st of July.
SourceHence, you need atleast one post between the 21st of July and the 4th of August, one post between the 4th and 18th of August, and a total of 30 posts (including your current 11)