188319 Phpbb fix - allow user to view

I need a very very simple modification. On the phpbb 2 forum I have I want this 1. For example when a user goes to the forum ID = 79 ex : /[login to view URL] 2. They get to post a new topic like they do now 3. BUT they should not be able to see other's topics. So if JOHN posts topics to forum id = 79 he should be able to see ONLY his posted topic.. its like a support helpdesk i wanna make so making one of the forums into that.. some users dnt want others to see their issues.. so maybe if u can HIDE topics for others until when they visiting that section until its their own orginal topic.. only original poster and admin should be able to see..