When you create a new event, your simulated attendance box is pre-filled with random names generated by the system that you can edit in two ways.
First, you can just add name in the Attendee names to simulate box and hit enter or tab.
Or if you have a lot of names that you want to add/bulk upload names, then you can just use the csv template here.
Replace Name1, Name2... with the names you want to show.
If you are running a webinar where only female attendees are attending, you can download this and upload it using the Import Name List CSV option
If you have a webinar where only male attendees are going to attend you can download and use this.