I believe the posting of images was restricted to members-only because people were abusing the system. Signatures would be a loophole to that, would they not?
And regarding your old posts, there is a search facility at the top of each page on the forums. Typing your user name there will take you to all topics you've started, and posted in.
Here's a link the the precise search, to save you time.https://www.google.com/search?q=Lord%20Fred100+site%3Awarzone.com%2FForum