What are the bits of text or images shown behind a comment?

[sof¡¡¡a]

Hi! So, since I joined the forum, I have noticed that some people have custom messages and pictures and/or images below any comment or post they publish. What are those and how can I get them?

 

[sangv]

They're signatures, and you can edit yours here: https://utaforum.net/account/signature

 

[sof¡¡¡a]

They're signatures, and you can edit yours here: https://utaforum.net/account/signature

Thank you!