You can invite a user to Moon Invoice using the below steps: -
1. Open Moon Invoice application in your Web browser from this link
2. Click on Teams option from the left-pane
3. Click on + icon from the top-right corner of Team window
4. Enter the user's name and email address
5. Select the Modules which you want to allow access
6. Click on Invite button
Once you click on Invite, the user will receive an Invitation email from Moon Invoice. They can access their account from that link.