How do I install Stag theme?

You could install the theme in two ways:

1. From the WordPress dashboard

Go to Wp Dashboard->Themes, click on the Add New button, then click on the Upload Theme button. Select the stag.zip archive located in the Stag Theme folder from the downloaded package from ThemeForest and click on Install Now button. The theme will be uploaded and installed. Afterwards, activate the theme to finish the installation process.

2. Manually, via FTP

Unzip the stag.zip archive and upload the "stag" folder into the "wp-content/themes/" folder on your server, using a FTP program like FileZilla. Afterwards, go back to your WordPress Dashboard, navigate to Themes and activate the Stag theme.