Most likely you have added an external LDAP (or Crowd) user directory, and then disabled the built-in "Internal" user directory.
What do you actually want to do? Add a user to LDAP (Crowd) ? then contact the LDAP admin.
Add a user to the Internal directory? Then you need to re-activate it.
... or add some more details to the question
You'll need to make one of them read/write in order to add someone to it.
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As a Jira admin, change it to read/write.
You may need to talk to the admins of the directory - that could also be read-only, and that will need updating to allow Jira to write to it.
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