To add a theme to Drupal, follow these steps:
1. Download the theme file from a reliable source.
1. Log in to your Drupal account and click on “Appearance” from the top menu bar.
1. Click on the “Install new theme” button.
1. Select the downloaded theme file and click on the “Install” button.
1. Once the theme is installed, you will see it in the list of available themes.
1. Click on “Enable and set default” to activate the theme and make it the default theme.
1. Customize your theme by clicking on the “Settings” button next to the theme.
1. Make the necessary changes to the theme and click on the “Save configuration” button.
1. Your new theme is now active and ready to use!
