To edit a feed select the feed from the list in the left panel. From there select 'edit feed' to open all feed settings. Once you are done be sure to save your changes!
Use the edit view to modify the feed settings. You can change the filters, rename the feed and change email notification settings.
NOTE: When setting up or editing custom feeds the logic is to use 'or' within single filters and 'and' between different filters within the same feed.
For example you could use a filter to capture visits to domains that contain: lead, feed, app, and it would pull Leads that visited any page with the domain that contained any of those terms.
If another filter is added to the same feed, such as 'location' set to 'France' the feed would collect leads that visited the domains that contained lead, feed, or app AND came from Leads located in France.