How do I capture who performed an action?

Step-by-step guide

Go into Modules.
Open the Module that you want to capture the date in.
Go into the Workflows Tab.
Navigate into the Users’ Actions.
Select the Action that you would like to capture who performed the action.
Once you’re inside the field select the Sub Actions Tab.
Then, click on the Sections Button to add a new section.
Once in the new section in the Field Area, put the field name for the field that you would like to capture the date for.
In the Value Field type %(loggedinuser)%
Click Okay.
Click Save when complete.