How do I upload a file to a subfolder using FileZilla?

I'm new at this. I have looked for info on Inmotionhosting but can't find anything that helps me. Here's what I am doing: I save info to a zip file on desktop & then unzip to another file. In Filezilla I find the file & upload. In Inmotionhosting it shows up in the /public_html but not in the right folder. Then I move it to the correct folder. Nothing shows up when I go to my web site & I do the 'F5' thing. I have done different variations of this. But NOTHING, NADA! HELP! Sue R
I am using Artisteer. I will be updating the web site every day & right now the only way I can do that is uploading the whole zip file instead of a single file. I need to know how to upload a single file.