Joomla creates an admin account by default when installed, but it is nice to have other users for many reasons. Different user accounts allow you to track who did what, and they allow you to grant different permissions to different people. For instance, whenever I log into a Joomla site to change things or perform maintenance, I always log in with my own user id, instead of the default admin. Also, I am happy to give posting privileges to many people, whereas I do not want to give template modifying permissions to those same people. The solution is multiple user accounts.
To create a new user
1. Log into the Joomla administrator page by going to the website and adding / administrator to the end of the URL.
2. Click on the User Manager in the control panel or select User Manager in the Site Menu.
3. Click on New.
4. Type in the user's name. This should be their first and last name, and their middle name or initial if they use it.
5. Type in the user's user name. This is what the person will use to log in. Since you need the user's email address to create the account, I suggest using the same user name as their email address. So, if the email address is Joe @ JoeSmith.com, then the user name would be Joe.
6. Enter the user's email address.
7. Set up a temporary password and then retype it in the next field. This password is sent via email to the user, so do not use your favorite password.
8. Next, select the group to put your user in. Read through these definitions below and make sure you choose the correct group. Detailed information is more available at Joomla.org in the documentation .
Registered means this person can see restricted content, but can not do anything to it. Author means this user can create new articles on your system when logged into the front end of the system. Editor means this user can change other people's articles on the system. A publisher can publish and unpublished articles on the system. (This is not deleting the article, but a publisher can prevent articles from showing up for viewers of the site.)
A manager has all the permissions of a publisher, but is also allowed to access the administrator side of the site (the URL with administrator in it). A manager can access and change the menu items, use the category manager, and can use the section manager.
An administrator can do most things on the system with the exception of changing the template, sending mass email, changing global configuration settings, or adding components.
9. Select No for block user, since you are creating this user and what them to be able to log in.
10. Decide whether or not the person should receive system emails.
11. Choose the languages and the editor. A default Joomla installation has TinyMCE and No Editor available. No Editor means the person does not get a text editor and they have to type in their HTML. This can be convenient if the person does all their work in Dreamweaver and just wants to copy it over.
12. Set the time zone.
13. Hit the diskette at the top and save.
Congratulations, you've just created a new user.