A. Archive One Item:

1. Please log in to your Bridge. 
2. Once you log in, your account will put in you "Edit" view. Edit view allows you to have more edit capabilities more quickly.
3. Browse to the item that you wish to archive. You'll notice near the item an "Archive" link.  Click this link.

B. Archive a Group of Items in a Pattern or Collection:

1. Browse to the pattern / collection that you wish to archive.
2. On the pattern's page, at the bottom, there is a link  "Archive."  Click on Archive.