In order to import specific contacts into a mailgroup inside addemar you need to go to your "segment section".
Follow the below described steps to complete this import.
1. Make sure your contact group already exists, if not create the contact group ( see the following FAQ : Create different contact groups )
2. Open the needed contact group by clicking the group icon at the action panel ( right side of your screen ) and click the import contacts button.
3. Once the contact group is opened you'll notice an "import contacts button on top of the page" ( inside the red bar ). Click this button and go through different steps of the Import Wizard.
4. If you have completed the wizard, the contacts are imported or the import is scheduled.