xtremeassasins

lol. Its not a button, Its a hyperlink. I just increased the size,made it red, aligned to center.

For example:
BB Code in Forums:
[center][color=red][size=14pt][b][url=http://xtremeassasins.tk]Official Website/Forum[/url][/b][/size][/color][/center]
Its called "Hyperlink" function.

P.S: This can be done in HTML Also, If you need.