To invite someone to be part of your organization in Uizard, click on 'Team.'
Click 'Add new team member,' then write the email(s) of the person(s) you want to invite.
After indicating whether you'd like them to be a creator or a viewer in the drop-down, you can click 'Invite members.' The person(s) will then get an invite to join your team through email.
They have to accept the invitation and create an account in Uizard (if they don't already have one), then they are ready to collaborate with you.