To change a Saved Search in order to add a new search criteria or update existing ones:
Open up the module that the search is for.
For example, click CRM, then Contacts.
Click the Search drop-down and click Select Saved Search.
Locate the saved search you want to change and click Select.
Click Search.
This will open up the yellow box search form for the search you have selected. On the left will be a list of the current search parameters.
To change an existing Search Criteria locate its tab, and change the values in the yellow box for it.
To add a new criteria, locate the field you want to search on and enter the search parameters for it.
After you have made the changes, click Apply to run the search.
To save an updated version of the search, use the Search drop-down and select Save Search.
This will give you the option to save over the existing search, or you can rename the search to save it as a new copy.