Nookipedia:Signature policy

Signatures are used to sign one's message on a talk page or forum. To do so, four tidles ( ~ ) are used. If three tildes are placed, just the signature will be placed, and five will produce the timestamp.

When to use
It is never acceptable to use one's signature on any page other than a talk or user page. Never on an article should you sign your work. Doing so will invoke a warning and the signature being removed. If this happens multiple times, a block will be issued. It is required that one signs comments on a talk page. If you come across an unsigned comment, then use the template to sign it. To find out who originally posted the comment, look through the talk pages history. If it was you who forgot to sign your comment, then you still must use the template, otherwise an incorrect timestamp will appear. If you saved the page and fix it a second later, then it is fine to sign normally, but not if another user has commented.

Images
Your signature may include an image, but it must not disrupt the line spacing. This means that it must be about 12px. No 50px image in a signature, it just ruins the page!

Links
Your signature must include a link to your userpage, and it is highly recommended that it links to your talk page. Other than that, it can link to any other page on the wiki. External links must not include any offensive material.

Information
Your signature must at least contain part of ones username. For example, a user named User cannot have a signature that says "-GiggliGirls007". That cannot identify the user properly. A signature for LlamaQueen could be "Llamas [they be da bomb] " as that contains part of LlamaQueen's name. It is recommended to have as much of your user name as possible in ones signature.

Colors
It is acceptable to change the colors of your signature, just not to bright colors. No white, cream, or neon colors, as those may not be visible or may cause seizures.