How do you get a signature thingy?

I know lots of people have special signature things they write below their names, but how do you do it? Is there a special place below it? I notice the messages are all like:


Hello.

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Rowanepic is c00l.




Or something like that. Please reply if you know.

 

Click the button that says your username then there will be a a signature button click that then write your signature.

 

You know how your name is in the corner of your screen? Click on it: There will be two rows of options. Click on 'Signature'. Bingo!
Sorry if this is hard to explain, I'll try to post a screenshot to show you later.

 

Here, follow these.