To add keywords to your projects, go to the Rankings tab on your project. Keywords are the default sub tab shown.
Then, go to the '+ add keywords' button to add one keyword per line.
To search for a location, open the location box and search. We use Google's location coding so if it's on Google, it should show.
When done, click the 'Add Keywords' box to submit them. Ranking results take a few minutes to come through.
Here's a video if you need some help: