Help with deleting pics within the pic directory storage

Ok I get it we can only have 18 pic Limit in are Pic Libary,well if thats the case how do i delete some pics once i reached my   limit within the Libary....

I redad the He;p page on the  add and  what not on the pics but it says is to  ctrl plus  click nothing  this suxxxxx  Help please if anyone has figured it ou  ... Thanks  love yea guys later ....