How many new posts have you made since you last applied ? (if it's less than 3 you can not apply)
sample: 102
How could I know how much posts have I made since I last applied (I'm not sure about the exact number on the last form)? I can find only total number of posts again.
Click the profile button on the menu bar at the top of this page. Then click "show posts". You can see all the posts you ever made on this forum in date order.