There are two ways to run a geogrid if it is a SAB.
The first option is to locate the SAB on your dashboard and then type in the address where you want your default centre of the geogrid to be.
Then you go to the Geogrid tool and Run a Geogrid
2. The second way to run a SAB Geogrid is to drag a geogrid to the correct place where you want to desired geogrid