This question has been asked before and everyone seems to point to this document: https://confluence.atlassian.com/display/JIRA/Managing+Users#ManagingUsers-deactivateuser
But when I login then I don't have an "Active" checkbox. I am the Administrator.
I found the answer to my question in documentation that is meant for Jira OnDemand and not the documentation that shows up when we Google the question. I can't find the page where I found this information but I think I got there by following the documentation links after clicking on the "?" icons within Jira.
Basic steps to disable/deactivate a user are:
This will only prevent access to a specific application for this user and keep the count of your user licenses down. To prevent this user from logging in, I simply changed the password because I still couldn't find a "deactivate" button.
A user without Application Access cannot login - they'll see the "Log In" link at the top right even after trying. In addition to removing Application Access, you should remove the user from any groups.
The best way to Google something like that is to include "OnDemand" in your search, ie JIRA OnDemand delete user or JIRA OnDemand deactivate user; it should be in the first few results.
I answered this in response to your comment on https://answers.atlassian.com/questions/205126/how-to-delete-user-who-commented-issues-in-the-past?page=1#206427
If you're using OnDemand, you won't - those are documents for the download version of JIRA. Check outhttps://confluence.atlassian.com/display/AOD/Deleting+or+Deactivating+JIRA+Users
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