Help with forum language and theme please!!!

[www.lost-systems.com.ar]

Well, i'm building my own forum and i would like to know how to install a new theme and to change the language from english to spanish, or if one of you could do it for me.
url:Http://www.lost-systems.com.ar
or if you would like talk to me directly my e-mail is:magnatraker@hotmail.com. thanks...

[Paretje]

Only use the language vars and install the Spanisch translation on you board, when the user selected Spanish (or the default is Spanish and the user didn't select an other one), he gets the board in Spanish.

For example, this is the default header template

Code:

You are not allowed to see code.

[www.lost-systems.com.ar]

i've got the forum already, the problem is that it only has one default language an only one theme, how do i upload new ones? i don't know anything about language vars.

or if you could do it, i would give you the password and the direction.thanks...