Create your own free account for join.bimcollab.com. Insert your email address, first name and last name. You will receive an email to verify your email address. Confirm your registration by clicking the link and get started.
After confirming your registration, fill out additional details and name your first project. With this project you can start from scratch. You will also have a test project where you can jump right in and work with existing issues.
Invite team members to your project. Find current team members under the 'Project Setting". Click 'Add team member' to invite others. This person receives an email with a link to accept the invitation. That's all.