If it is not listed, you have not installed it yet. Install the addon, then you'll have a licence box to paste your licence key into.
Have a look at https://confluence.atlassian.com/display/UPM/Universal+Plugin+Manager+Documentation if you're stuck on using the UPM to install and licence addons.
Edit: Sorry, I forgot the other case. If the addon has failed to load/start for some reason, then it won't show in the list of addons. You'll need to read your log file to find out why it's failing in that case.
Hi all! My name is Miles and I work on the Marketplace team. We’re looking for better ways to recommend and suggest apps that are truly crowd favorites, so of course we wanted to poll the Community. ...
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