To enter a custom location, you must manipulate the URL of the webpage. You can only determine a point up to 2 decimal places.
Custom Latitude/longitude values cannot be entered from within the app. In the app, you must find your location by navigating around the map view. Tip: you can use your saved Favorites to navigate quickly to a specific location, if needed.
I am currently at (32.5, -118.3). I can confirm this using the box in the center of the screen (from where the red arrow stems) or the URL (in the red box).
To go to a specific location (32, -119.59), I just need to edit the highlighted numbers in bold