It's not too hard; try this-
1. Go to TUCOWS.com
2. Download and install "CuteFTP"
3. Open CuteFTP
4. Go to the site manager, and create a new site
5. Fill in the blanks. One will ask for site name (anything you like), the next will ask for the host address (
www.yourisp.com), the next will be your login, and finally your password. Click "save password" radio button, then hit ok
6. Highlight the site on your list, then hit connect
7. Open your HTML or public_www file (whichever one is there)
8. on the left side of the screen, browse to where you have saved your zip file
9. Drag-and-drop it from left-to-right
10. Come back here, create a post, and write:
{url}http://www.yourisp.com/~yourname/yourfile.zip{/url} (remember to replace the {}'s with []'s).
That will do it!

Cheers!