using smartftp


I am new to smartftp.
I have created my website in NVU, and was recommended to use smartftp.

Problem is i really don't understand what i have to do.

i am able to connect, but then when i drag the files that i want to upload to my website from the right hand box to the left hand box (the left hand box automatically then puts then in the bottom box)

when i click the Upload arrow thing, it trys to upload but then says retry?

what should i do?