This tutorial assumes you are already logged in to your Joomla admin panel
1) Click Site
 
2) Then User Manager
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Here is the list of all the users that have registered for your site. Let's see how to add a new user

Scroll right
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3) Click New
 
4) Type in a name for the new user

5) Enter a username
 
6) Type the user's email address
 
7) Enter a password and verify it

8) Set the back-end and front-end default languages

9) Click Save
 
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Once a user has been created, you can edit it if needed
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10) Click on the user's name

11) Let's change the user's group

12) Click Save
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Now let's delete the user we just created
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13) Click the checkbox next to the user

14) Click Delete
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The last thing we'll do is see how to force a user to logout
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15) Select the user

16) Click Logout
 
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That's it! You now know how to use the User Manager in Joomla