Ok I'll take a crack at this and first find out what you have put into the remote address part. Should be something like /public_html or /public_html/
I've found that some programs want that trailing forward slash / and some don't
Is this what you have there? If not, give that a try, if so then double check your login information to make sure it's correct. It should be the main account settings that you use to log into cPanel.
Lastly, if the above is for sure already correct, check to make sure your security software isn't blocking the upload. You can do this by turning off your security software for a few minutes while you upload. If it is blocking it, see if you can find the settings to trust the program and the connection.
Let me know if any of that was helpful and if not, we'll have to try from there and hopefully someone else will have some other ideas too.