New Post: Checkout problem

Ok your skin's style.css stylesheet has color:#000000 on the form tag.

You can change that to color:#ffffff if you want it to apply all over.

Or you can put this into the store's style sheet override template if you only want it on the store pages:
form{color:#ffffff}

What you also need to do is Install Firefox, type Get Firebug into Google and get it, and then watch any of the following videos:
https://www.youtube.com/results?search_query=how+to+use+firebug+to+edit+css

Regards
Rob