You may want to transfer some document to ucoz. For this purpose, ftp will be needed. I observed that it doesn't allow php, html file upload. Later I learned that it is available in paid service.
Login to ucoz and get your ftp login. For first time, you need to reset password as well.
Use your domain name (deepak.ucoz.net) and user name/password as you got in previous step.
Use Filezilla free software. It is easy to do with this software.
Refer http://forum.ucoz.com/forum/37-2500-1
http://forum.ucoz.com/forum/37-2500-1
http://faq.ucoz.com/faq/20-1