Try to use the edit button on your post. To make a download link to something, make an account on a file hosting website, like
http://box.net and upload the file you want people to download. Once you've uploaded it, click "Get link to file" and copy the link that's in there. When on the forums, you can link to the file by typing
[url]paste link here[/url]
. Or you can take the easy way and attach the .bls save file to your post.