First, Ensure you have the appropriate membership package with sufficient number of team member accounts.
Then you may follow these steps:
1. Log on to your B1G1 account
2. Under the Connect tab, click the Invite sub-header
3. Click on the Invite Team Members button
4. Enter the relevant information and click Invite or invite multiple people by clicking on the Upload CSV button
*Hover over the 'i' icon to look at the format you should enter the invitation details in.