To add team members, you need to share your team ID with them. To do this, naviagte to settings. Settings can be accessed by clicking the link in the sidebar in your dashboard.

From here you can see your InvoSync email address which can be shared with anyone who wishes to add invoices and receipts to your inbox.

Your team ID can be viewed by clicking on the "eye" icon to the right. Send this ID to users who wish to join your team.

Warning: Keep this ID secure. Anyone who uses this team ID will have access to your team's invoices.