WordPress allows you to add new users to your site, and also set a specific role for each of those users, limiting their capabilities if desired. For more details about these roles and capabilities, please read this description in the WordPress Codex.

To add a new user:

1. In your WordPress Dashboard, go to Users > Add New.
2. Fill out the necessary information.
3. Be sure to include the username, email address and the role for your new user.
4. Click the Add New User button.

To change your existing users’ information or role:

1. In your WordPress dashboard, go to Users > All Users.
2. Click the Edit link in the menu that appears when you hover over the user’s name.
3. You will be taken to that user’s profile page.
4. On this page, you can change the user’s name, email address, profile information, bio, role, password, etc. You cannot change the username.
5. Once you have completed your changes, click the Update Profile button to save your changes.