Users can be added by the System Manager. If you are a System Manager, you can add Users via
Setup > User
There are two main classes of users: Web Users and System Users. System Users are people using ERPNext in the company. Web users are customers or suppliers (or portal users).
Under User a lot of info can be entered. For the sake of usability the information entered for webs users is minimal: First Name and email. Important is to realize that the email address is the unique key (ID) identifying the Users.
1. List of Users
To add a new user, click on "New"
2. Add the user details
Add user details such as First Name, Last Name, Email etc.
The user's Email will become the user id.
After adding these details, save the user.
3. Setting Roles
After saving, you will see a list of roles and a checkbox next to it. Just check the roles you want the user to have and save the document. To click on what permissions translate into roles, click on the role name.
4. Setting Module Access
Users will have access to all modules for which they have role based access. If you want to block certain modules for certain users, un-check the module from the list.
5. Security Settings
If you wish to give the user access to the system only between office hours, or during weekends, mention it under security settings.
Next: Role Based Permissions