To add your Co-tenant(s) you can doe the following:
go to the my Space Tab
In the upper right corner tehere is a + icon
Press this, fill out the details.
Your Co tenant will have received an email with their Space code.
Be Aware,
If you are not the main tenant in the system you will not be able to add someone.
If you do not know wo is your main tenant or on't have one. Please reach out over chat or email.