If you didn't get the Booth invitation email due to some technical issues, please follow the given steps:
Step 1: Connect with the event organizer and ask him for the event link.
Step 2: Click on the event link and register there using the same email address added by the event organizer.
Step 3: As soon as you enter the event, you will land up into your assigned booth and should be able to edit and make it ready for the event.
Note: Please make sure to log in using the same email id entered by the event organizer as booth exhibitor.