You can add a new member in the Settings section under the Members tab. Here you click on the Add member button in the top right corner. Then just enter the member's email and confirm.
Members added to the partner administration automatically gain access to associated demo accounts.
You can also grant the new member access to your clients' accounts. In the client organization, find the Members tab in the setting, where you click on the Add member button, fill in the email, accesses and confirm.
