How do I change the the left margins of the form or the padding, or is the boxes too wide?
Looked through the css, changed .cmtx_form {
margin: 5px;
padding: 5px;
What you've tried works for me so you'll need to provide the URL of your page so I can determine why it's not working. You can PM me the URL if you prefer.
I also tried added padding in just .cmtx_container (instead of .cmtx_container a) but no diffrence another problem i have is that the rss alerts link doesnt seem to work properly.
I've looked at your page again and you haven't added the ".cmtx_container" code on either of the links you sent me. You have added ".cmtx_container a" and ".cmtx_container img" but that won't work as it only targets links and images. In fact those are actually ruining the styling of those elements. I know you've said that you've added the ".cmtx_container" code and that it didn't work but I'm certain that it will work so please can you add it so I can see it not working. You've added it to the file that you've attached but that file is not the same file on your website.
You have some odd characters at the very beginning of your /upload/rss.php file. Try placing your cursor at the very beginning of the file and press the delete button a few times to get rid of them.