Open invite form
Click on the button on the bottom of the participants list. A window will pop up, where you can invite new participants.
Select users you would like to invite by clicking on their names in the list. Click on "Add" button to add them to the board participants list. You can also double-click the names to add. Click "OK" to confirm invitation.
New users are added to board
Selected users will be invited to the active board. If they have IDroo running they will be added to the participants list. Otherwise they should start IDroo. As soon as they start IDroo, they will be connected to your board and you can start collaborating. You can also send invitations through Skype chat.