To setup your FTP connection in Dreamweaver, you first have to define your site.

Select Site > Define Sites and a window like the one you see below, will appear.

Select New.

Enter the name of your site, the root folder where the site is located as well as the HTTP Address where you wish to upload the site. After that select Web Server info from the left menu.

Select the Server Access as FTP. Fill in the information as below.

ftp host = ftp.your-domain.com
host directory = leave blank
login = ****** = the username sent in your welcome e-mail (usually it is your domain name minus the ".com")
password = ******* = the FTP password sent in your welcome e-mail
passive FTP = YES, check this box

Click OK to complete your FTP setup. You may now use Dreamweaver to upload your files to your account.