To use GoToWebinar 'Change Subject' action to initiate another reminder mailing, follow these steps.
In AEvent, go into your Timeline.
Under Action, update the When section for when you want to send the email. Be sure to select either the Before or After tab.
Under Who, select who you want to send it to.
Under What, select GoToWebinar then choose “Change Subject/Title” from the dropdown menu.
Under Subject, type in the new subject line.
Click Add Action and Save Changes.