How to add users to a group?

I created a group but cannot figure out how to add any users to it. I cannot find any instructions on this either. Thanks 

Hi there,

Please follow the steps below to share the device:
1. Click "Me", then click "Share".
2. Click "+".
3. Type the Lepro+ account that you want to share with.
4. Select the device you want to share with.
5. Invitation sent.
6. The invitation notification will be received in invitee's inbox. After the invitee clicked "accept", his/her account will be shown on your page.
7. For Android devices, inbox can be found by clicking "Me"-->"Share"-->the top right corner.
- For IOS devices, inbox can be found by clicking "Me"-->the top right corner.

Best Regards,
Lepro Customer Service Team

I’ve followed these instructions to the letter but when I hit share I get an error message “System error. Please try again later”. What is causing this

Any fix for this?

No I never received any feedbck

Dear User,

We sincerely apologize for any inconvenience this issue may have caused. We have sent you a direct message to provide further assistance.
We look forward to your response to that message.

Best regards,
Lepro Customer Service Team

What is the fix? I have same issue