Click Join a meeting on the sign in screen.
Enter the meeting number, link, or video address. Then, enter your name and email address, and then click Next.
If there's a meeting password, you'll be asked to enter the password before you can join the meeting.
Webex Teams | Join a Meeting as a Guest
Quickly join your meetings as a guest without having to sign-in, whether you’re a new user or you’re having trouble signing in. You can join Webex Meetings and Webex Teams space meetings as a guest.