Adding a Link and button

[beautibella]

I have a theme that uses the default theme how do I add my shop link and my shop button.  Thanks

[Oldiesmann]

1.0.7 - http://www.simplemachines.org/community/index.php?topic=7854.msg75035#msg75035
1.1 RC2 - http://www.simplemachines.org/community/index.php?topic=63203.0