Please follow the below mentioned steps.
1) Find the appropriate breaker (having LSIG function) from list of Static Trip Breakers and select it in the TCC.
2) Click on Function/New/Name it as a Ground/Click on the Ground Function row/ under the sensors column select Neutral /Click on update/ hit OK.
3) Now you will have an option to select device from Library. Please refer to the second screenshot below.
4) Click on the Library/select the appropriate Ground Fault Breaker/ click Apply. You should see the Ground Fault curve in the same TCC.