help with installing theme

I have followed the instructions to upload a theme at the cpanel and it goes into the ftp file. In the directions it says “If you have WordPress installed in it’s own folder called wordpress, you would navigate to “public_html/wordpress/wp-content/themes” and if WordPress is installed in your web-root folder you would navigate to “public_html/wp-content/themes”.
I navigate to the themes file in the public html and when I upload it goes into the public ftp file. when I go to my admin panel, the new theme is not there to activate. How do I get it into the right folder? I have tried to move it into the themes folder in cpanel andcan’t seem to do it right. Thanks for your help in advance.
Traci