Create

You can save any search you do both on Overview or Export pages using Filter feature -

"Save filter" button appears after you choose any search option.  

Edit

The full list of filters you can find in the beginning of the search line. There you can edit filters' names and/or delete any filter.

Update

If you choose any filter, add/delete any search option inside this filter, and then click "Save Filter" button, you will be proposed either to Update an existing fitler or Create a new filter (and choose another name) -