Hi,

If you need to set up the signup for the external users to your odoo instance, you can enable it from the General Settings. Navigate to Settings -> General Settings , under Permissions tab you can see the option called Customer Account.

Once you enabled this in the settings, if you go to the login page of odoo, you will see the option for Sign UP.

On Clicking it, user can sign up by entering the details like Name, Email and Password.

And for setting up the default access rights for the new users, you can set it from the same settings page.

If the users need to reset their password, they have the option to change it in their portal. Under the Account Security in the portal page, there is hyper link named Edit Security Settings, once you click on it, users can change their password.

Once you click on it, you will see the option to change password.

Thanks