First, attach all of the files that you'd like to link to.
If you leave the "List" checkbox checked, the attachment will automatically be linked to at the end of your page. Alternatively, you can insert your own link within your page. To do this, right click over the red filename name of your attachment, and copy its URL to your clipboard (This is done in most browers by right-clicking and then choosing something with words to the effect of "Copy Link" ).
You may then use this URL like any other URL as the destination (Link URL) of a link. For information on inserting a link, see Insert and Edit Links.