Login to your Glow account.
Once logged in, click on Support Tickets from the main left hand menu.
The Support Tickets screen will load the All tickets tab from the inner menu automatically.
Find the ticket that you want to close and click into it.
You will now see the ticket correspondence screen, showing all communication going back to when the ticket was first raised.
To close the ticket, click on the Close ticket link in the top right corner.
Before you close the ticket, Glow will ask you if you need to allocate anymore time to it:
Having clicked the Close ticket button, you will now be returned to the Support Tickets screen, on the All tickets tab of the inner menu.