Help with spatie

[Yu100999]

So new to laravel here, im implementing the activity log for my project and everything's going well but im just not able to grasp how i should be implementing the
activity()
->causedBy($userModel)
->performedOn($someContentModel)
->log('edited');
I want to get the causer name (ie username) on a table but i have no idea how, where should i put this code? Any advice would be nice thanks!