Geograph - photograph every grid square

The Geograph search only shows you most recent 12 searches (unless you [save a search]). As you add more searches the oldest will drop off the list.
You can [save a search] by clicking the blue hollow star to the left of it on the list - the star fills in and the search becomes 'favourited'. To [stop saving] an individual search, click the star again and the search will drop off the list like any other unsaved search.

The Geograph search only retains you most recent 35 searches (unless you [save a search]). As you add more searches the oldest will drop off the list.
You can [save a search] by clicking the yellow hollow star to the left of it on the list - the star fills in and the search terms are then shown in bold. To [stop saving] an individual search, click the star again and the search will drop off the list like any other unsaved search.

If the image has not yet been moderated go to the 'Change image details' page and click the [request rejection of this image] button, explaining it is the wrong image.
On a moderated image, open the 'Change image details' form and, in the box near the bottom of the page labelled [Please describe what's wrong or briefly why you have made the changes above...] ask for the photo to be rejected and give your reason. Don't forget to click the box marked 'Bring this issue to the attention of a moderator' before clicking [Submit changes].

Accounts cannot be deleted - see this answer http://www.geograph.ie/faq3.php#103

If you have submitted no photos the only way anyone can find your account is by trawling through every account number - in November 2015 there are around 122100 of them.
If you are still concerned about your name or email address being available you can edit your profile to anonymise your name and introduce an error into your email address (which is not visible unless you have set it to be so).

Using this form https://www.geograph.org.uk/snippets.php tick the 'Only show my descriptions' box and add a keyword then click [Find] - there is a delete button beside each result.
If you find more than one description with your search ensure you pick the right one.

Short answer: you can't. But please read on...

You can't revoke the Creative Commons licence you have given The World when submitting your photos, and we would like to ensure as best as we can that you continue to get credit for your images wherever they are used. If you stop submitting, your existing photos remain visible and credited to yourself for this reason.

If you would prefer no longer to be identified as the photographer of the photos you have uploaded, you can change your real name in your profile http://www.geograph.org.uk/profile.php?edit=1 to show a pseudonym, or you can ask us http://www.geograph.org.uk/contact.php to anonymise your account. In either case, your decision is reversible should you change your mind - which of course we do hope!

Once you have pressed the "I agree" button your picture is in the system and subject to the Creative Commons Licence.

If the picture has not yet been moderated, you can requested for the image to be rejected, and you will be asked to give a reason. To "self moderate" in this way you click on the "Change Image Details" link under the picture: you should see an icon for "reject".

Once the picture has been moderated and accepted you will probably need to give a very good reason for the image to be removed from display. Images may be removed from display if they were taken illegally, or, for example if a landowner objects to a picture taken from a place without public access. This process of removing from display is sometimes referred to as "vaulting" as a copy of the picture remains in the "vault": a file storage area.

See also "I have licensed an image larger than I intended, can I remove it?" http://www.geograph.org.uk/faq3.php#93