I got this message and it looks ridiculous to me!!
To view links or images in signatures your post count must be 2000 or greater. You currently have 20 posts.

Why should there be this restriction, even for viewing images in signatures?

admin, can you undo this ?

The reason this restriction has been applied is because spammers also use images for advertising their sites, by adding text to an image.

In the mean time you can use your profile page to create an album.

In a few weeks time this will be changed and you will be able to post images in your signature.