Hi Åsa,
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: To have this WordPress theme work first you need to download a WordPress file from wordpress.org Unzip the WordPress file and you need to paste all the files inside ftp -> public_html
. You also need to create a database from your cpanel too.
Hope this may help you
Thank you!