You need to be a little more detailed than that.
Just adding an internal Jira directory doesn't actually tell us enough to help you. You need to tell us if you are using Crowd, or if you are using Jira's internal system. If it's Crowd and you've added the internal directory in there, then you'll need to check the settings for that directory to make sure it's allowing Jira to update the system.
If all you've done is swapped Jira to use it's own internal system, then all you need is Admin rights and you'll be able to maintain users.
Start with Administration -> System information - that will tell you most of what you need to know about user management configuration.
It won't tell you exact details at a level you can use to start debugging it, but it'll be enough to answer questions you might get asked here if you're struggling with user related stuff.
If you are using the internal system, then it's there. You don't need to do anything other than log in as an administrator.
If you can't find it, then you'll need to tell us where you're looking and what you're expecting. What else do you have on the Admin-cog menu for example?
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