This is begining point for marking the attendance roll for your event.
You need to login with your Wild Apricot 'Event Manager' email and password. And enter the event number for your event.
Use a browser. The event number for your event is given in the Event Details screen of your event. Like this

In this example, the event number is 6450185
Be careful! If you have email, password or event number incorrect, you will not succeed.
If you get an error on the next screen, Click to Email Webmaster - preferably with a screen shot