Couple of things(if that link is your board):
1) That is "Nuke which is not supported here
2) In stock phpbb, .php images are not allowed as it is a security risk
Any info or advice you get here may well mess up your 'Nuke board, or take it down completely.
Best advice is to seek support from the 'Nuke forums, or where you got your board from.
---Never leave home without a towel and your peril sensitive sunglasses.
---Do Not PM Me For Support. It will go unanswered.