What if I didn't complete the said 14 activities/posts within 2 weeks? can I still post and cope up or am I stuck.
you must post 14 to get the maximum up in the duration, if you post less, your activity will not up 14 in 14 days.
This is the incorrect answer. You only have to make one post during a 2 week period for it to be marked active. Later on, if you make more posts your activity will increase by a maximum of 14 for each 2 week period that you were active as per the formula in the opening post of this thread. So yes you can catch up later.