Go to Catering > Venues > Venues (/admin/events/venues) — the group is called Events instead of Catering if your account doesn't have the Catering module. The page heading shows the active kitchen's name and has an Add new button. Venues are split into two tabs, Active and Inactive, each a searchable table with ID (click to edit), Name with the venue photo, Location (address, zip code, city) and Active?. Viewing the list needs the List Pickup Locations permission and creating/editing needs Edit Pickup Locations (Delivery Settings group).