You will have two options available to you, either via your favourite SFTP client (i.e. FileZilla - which is a free SFTP client) - or, you can upload your Files with the "File Manager" in cPanel.
Download Filezilla here:
PLEASE NOTE ONLY SFTP CAN BE USED FTP HAS BEEN DISCONTINUED.
SFTP Port for Enterprise: 35788
SFTP Port for Nexus: 35777
eg. of File Zilla Settings: