By "Patching" your database they mean to install the SQL required in the instructions.
Open the file googlefroogle.sql in a text editor like Windows notepad.exe
In your ZenCart admin open Tools/Install SQL Patches
Copy the contents of googlefroogle.sql and paste into the box in your ZenCart Admin
Click Send
I have done that and i got this message
1062 Duplicate entry 'GOOGLE_BASE_MAP_PRICING' for key 2. I guess the sql has already been loaded. I cant figure out what the issue is.