Woocommerce install issue, Godaddy, FTP ??

Hello,

I’m a very beginner here.
I was updating an old wordpress website (using godaddy service) and tried to install Woocommerce plugin, but it failed at first.
So I tired again, and I got “Installation failed: Destination folder already exists.”
And nothing happened.

So, I asked this issue already here, and I got this reply.
” You should go through FTP to find that folder and delete it – most likely an old installation that didn’t get properly removed.
Once deleted you should be able to install the plug-in again.”

What the… ????
I honestly have no idea what FTP is and where I can find it.
It will be grateful if anyone can help me !!!