If you would like users to self-register for use on your system you can enable the option in OPAC maintenance via the library interface. You will find the option near the bottom of the Options tab.
Once set to Yes an option will appear below the login area on your portal.
On clicking the register link a form will appear for the users to complete.
Once a user has registered they will receive an email asking them to verify their account. They will then be able to login.
An email is also sent to the library to allow them to complete any setup of the users account. A default access permission will be set based on the system default, but it is advisable to check this to ensure the user registering has the correct access level.
Both emails can be configured via templates maintenance.