Let's enable the Login Module. It's part of the Joomla! default installation, but it has to be enabled to become visible.
1. Navigate to Extensions | Module Manager. In the Select Type drop-down box, select mod_login. This will filter the long list of installed modules; only the Login Form module will be shown.
2. Click on the name Login Form to edit the module settings. Select Enabled: Yes to publish the module. The Position is set to left to display the Login Module on the left-hand side column, below the Main Menu.
3. Make sure Menu Assignment is set to Home only; this way, the Login Module will only show up on the home page. We can safely assume that users will probably want to log in to the site directly from the home page, so there's no need to clutter valuable screen real estate with a login form on other pages.
4. In this example, we'll leave the Parameters as they are. You could enter some Pre-text or Post-text here: a short text that is shown before...