You can find your workspace ID in the URL when you're in Clay. Look for the part after 'workspaces/' in your browser's address bar: https://app.clay.com/workspaces/ID-HERE/...
To search for your workspace or tables, open your workspace and use the search bar at the top to type the name of what you're looking for.
If you need further help, request human assistance by clicking on "Talk to a person."