How to pictures in signature?

Hey so, I can't figure out how to put pictures in a signature, and it didn't work. Also how to have them centered and lined up like in Thalia's signature?

Code:

[center][img]DIRECT LINK[/img][/center]

Here's the code I used in my signature to center the pic. Copy and paste the code into your signature, and replace 'DIRECT LINK' with the direct link to your image. If you want a picture from on your computer, press the icon with the photograph and floppy disc, and choose the image you want to upload.

Can you center a picture from your computer?

Yep, just put the center code around it.

Code:

[center]image[/center]

Thank you!

Wait I used my login for the servimg.com thing and it said it was incorrect.