You'll need to edit the css file. If you're not familiar with css, then search google for css tutorials and read up on it. It will be worth your time. There are css files in each skin folder, then there are some shared css files that can get imported into skins. They're in the rsc folder. I know one of the shared files controls the comment forms. Add this at the top of your stylesheet to import the default comment and form styles (as the custom skin does):

@import url(../../rsc/forms.css);	/* Import default form styles */
@import url(../../rsc/comments.css);	/* Import default comment styles */

Thanks! I do know some css, enough to get everything edited so it worked the right way ^_~

Though, there seems to be some borders around the commenting area, that I can't get rid off (not the dashed ones). How would I do that? I feel like I've looked and tried editing everything by now XD

fieldset {
border:none;
}