Here are the steps to use the login module on Joomla:
1. Log in to your Joomla site as an administrator.
1. Click on “Extensions” on the top menu and select “Module Manager.”
1. Click on the “New” button to create a new module.
1. From the list, select “Login Form” in the “Select Module Type” section.
1. Fill in the necessary information for the module, including the title and position on the page.
1. Set the access levels for the module. This will determine which user groups will see the module when they visit the site.
1. Customize the module as desired. You can change the module style, custom CSS, and more.
1. Click “Save” to save the module.
1. Preview your site to see the login module in action.
You can also customize the login module further by editing the HTML and CSS code within the module.