Log in to RoundCube Webmail with same e-mail address and password that you use for POP3 or IMAP access.
Connect to the web server using an SFTP client to transfer files. (Conventional FTP is no longer available, as it's not a secure protocol.)
If your web site uses a MySQL database, you can administer it using phpMyAdmin.
Manage your domain name registration (e.g. the WHOIS details, such as administrative and technical contacts) using the OpenSRS domain manager.
Online password changing is temporarily unavailable. In the mean time, please send a secure message to accomplish this.
Make a payment to Zygoat by any of several methods.