If you want to add user, open the cPanel management panel, go to the section "Preferences" and choose "User Manager":
Click the button "Add user":
Fill out the fields: Full name (optional), username (in our case it is user), choose domain (in our case it is your-site.com), enter your email (for notifications and account`s password reset) and password:
Below you can add services, that will be available for the user.
- Email. You can also set the quota.
- FTP. you can connect an FTP account for the user and set the quota for the certain folder.
- Web Disk. You can set user`s rights for the folder of your choice.
After you have added thy services you need, click "Create":
A user will be created with an email and FTP account. You can see the created user below: