Joomla provides a Login Form module used for login/logout purpose in Joomla. Once user logged in it gives a logout button and also provides user access additional resources on your site. Login Form will appear in the position which you have assigned to it.

To change the Login Form settings you required to follow the following steps:

1. Login to the backend of Joomla site(Joomla administrator).
2. Click Extensions -> Module Manager.
3. Here you will find a list of Joomla modules. Search for Login Form.
4. Click on the name of the module and you will find a edit screen of the Login Form module.
5. Now you can change the settings according to your requirement.
6. Once done save it and you will get a message: "Item Saved".