Start by installing the Password Reset Portal, as described in the Identity Manager 8.0 - Web Application Configuration Guide.
Once the password reset portal has been installed, two configuration parameters must be modified inside the IT Shop web project. They are called Link to password reset page and Link to password reset web. The following screenshot shows an example of how this is done:
In Web Designer go to Edit | Configure project | Web project to access the configuration parameters. Expand "General settings" to access the Link to password reset page and Link to password reset web options.
After changing the configuration parameters, publish the changes, and the "Manage your passwords" function should appear on the IT Shop landing page as shown below: