Template width, CSV import/export, widgets, custom CSS…

Hi. I just had the theme and I’ll be using it as an affiliate site.

1. I would like to know if it’s possible to change the template width regardless of the page layout. I mean to make the content area wider. I’m not referring to the page layout here which can be changed (1 col, 2 col or 3 col) if you know what I mean.

2. I installed the CSV import/export plug-in and tried to upload a CSV file but I can’t see where that file goes once uploaded!

3. If you look at my site (www.fashiontazia.com) you will see two advanced search boxes, one on top and the other one is on the left sidebar. How can I remove the one on top although there’s no widgets assigned to the right sidebar?!!

4. Where’s the custom CSS in the template? When I go to the editor under the appearance menu it says “NOTE THIS FILE IS NOT USED WITHIN THE THEME THEREFORE ADDING CONTENT TO IT WILL NOT WORK”.

Any help will be appreciated.