In the Web Interface:
1. Click on the Network
2. Click on the 'Devices
3. Under 'My Network
' locate the device in question and highlight it
4. Right mouse on the device and select 'Interfaces'
This will launch the interfaces view
5. Select the row that represents the port you wish to set the alias on
6. With the row selected, click on the folder (with a gear) icon in the top left hand corner (will be under the 'dashboard' link). This will pop a drop down menu. Elect 'Edit Selected Row
This will pop you a window that will allow you to set/modify/remove the port alias.