Your new licences will be listed in bold under the Available tab. To activate them, you can:
Drag the licence to the desired iLok device in the left panel, OR...
Select the licence and click Show Details. On the right hand side of the pull up box, click on ✓ Activate, OR...
Right-click on the licence and click Activate in the drop down menu that appears.
Please ensure you have a valid authorisation location for your licence. You will not be able to activate your new licence to an invalid location. For more information about authorisation locations please read Which locations can I use for my Sonnox licence?