Ftp login problem

I’m helping another person administrate his website. He uploaded all the files today, I have to work on setting up some other sections of the site. We setup 2 seperate ftp accounts, but apparently only one user can have access to the same files. So I tried to login using his login info and it keeps telling me that login info is incorrect. I know it’s correct as I used it to log into the panel but I can’t login to upload and manage files from my computer.

Is there some kind of restriction that only allows a user to login from a certain computer?

The web panel login can be different from the FTP login. Use the web panel and go to Users: Passwords. Then have the current login info emailed to the owner.