Importing XML problems

I’ve been trying to import an xml database that happens to be 6 mb to my blog. The maximum upload size is 2mb and I can’t figure out how to change it. I’ve been searching the web for a couple of days now looking for a solution, but none have worked.

Whenever I edit .htaccess I get 500 internal server error, and I really don’t understand why there isn’t a more simple way to increase maximum upload size.

Anyways, i would really appreciate some help on this issue 😀