Hi rdorsey,
If you want to upload the attitude theme in your domain via ftp then logon to ftp and go under public_html -> wp-content -> themes -> and unzip the attitude-pro zip file and drag/drop the attitude-pro folder under themes.
After it goto dashboard -> appearance -> themes (you will see the attitude pro theme and activate it.)
If you think that it’s really difficult then you can also even try another method.
Go to goto dashboard -> appearance -> themes -> Click on upload themes and install the attitude-pro.zip folder. Doing from there you don’t need to unzip the folder and activate it.
Note: If you have existing attitude-pro theme installed in your dashboard then first activate any other theme and delete it. Then after you can upload themes. First make a confirm that you have not customised any code. If you are using child theme and no code customisation in theme then your data will not be lost. If there is direct code customisation then all your customised code will be lost. So backup your file before taking any action
Thank you!