You can add users to a Managed Progress Board
Steps
Only Board Admins can add users to a Managed Progress Board
From the Board
Select My Apps in the top menu
Place your mouse over the Boards button
A list of Boards appears
Scroll down and select the Board you want to add people to
You arrive on the Board’s page
Select the About toggle
The Colleagues box will appear
Press the Add New button in the box
A popup launches in which you can add the names of new users
Press save
The popup closes and the newly added users will receive an email telling them that they now have access to this board at the permission level you chose; either Board Admins or Board Colleagues