To install the theme, first login to your WP Admin ( http://www.yoursite.com/wp-admin/ ) . After that, using the menu on the right, navigate to:
Appearance -> Themes -> Install Themes -> Upload
Then select the thefirm.zip (from the downloaded pack) upload it and activate it. If everything went well, your new theme is now installed!
Upon activation, the theme has added two new submenu items:
WP Admin -> Appearance -> The Firm Theme Options – the theme options panel
WP Admin -> Appearance -> The Firm Background Images – here you can select and manage the background image(s)
First thing to do should be to go to The Firm Theme Options and configure your new WordPress website.