What license do you have? With a Pro license, you can only use the Add-On. With a Premium or Enterprise license, you can use the Workbench Ansys nCode DesignLife integrated systems or the HBM nCode Glyworks interface. I cannot explain how to use those interfaces in the Learning Forum.
Do you have access to the Ansys Learning Hub? If so, there are self-paced training courses in the Structures Durability room that explain how to use Ansys nCode DesignLife. I recommend reviewing the Ansys nCode DesignLife Getting Started and Ansys nCode DesignLife Time Domain Analysis courses.