You should use the following data for FTP connection (you can see these data in FTP details):
FTP host: your_site.ucoz.com
FTP login: Nyou_site (N is a number or letter specified in FTP details of your account)
FTP password: the FTP password which you specified during registration.

To establish FTP connection you should use special programs, e.g. CuteFTP, FTP Commander, FTP Navigator etc. Don’t use browser for this purpose. You can get additional information about the mentioned and other programs by means of search engines (Google, Yahoo! etc.).

For FTP programs to work properly you should check your network settings, the settings of firewall and antivirus software.

It is desirable to look into error log. If there is a connection to the server an error will be clearly described. If there is no connection then there is something wrong with the network or client settings. You may often need to use passive mode, if your provider sets limitations.

ATTENTION!

To establish FTP connection you should observe the following conditions:
1. Your e-mail must be confirmed.
2. Security programs must not forbid FTP protocol connection.
3. The passive mode must be selected.
4. Enter the data into FTP client manually, and not by means of copy/paste.

Upload .htm and .html files via File Manager. Static files are not very welcome at uCoz. If you need them more then 10 you have chosen a wrong hosting.