To add a search to your Saved Searches, simply click the Save Search button below:
Afterwards, your search will be saved in the following drop down menu, where you can simply select it again at a later date. You can add as many Saved Searches to this list as you would like!
You can even view, edit, or delete your Saved Searches under My Account. This is located under the Saved Searches tab in the Bidding Section.