There's a few ways:
• You can report yourself for a reason of "Other" and let us know what you would like in the text field.
• You can open a new DNP and let us know in the instructions that you want to rescind (or amend it with whatever changes you would like, if appropriate) your current DNP.
• Since you've asked about it here and I've replied, please feel free to PM me what you'd like done, if the above solutions are less fun :)
If you had images taken down and would like them restored, please also let us know if you want all of them or a subset.