1) Login to Webmail
2) Click Roundcube from the webmail options.
3) You will then be logged into your webmail via Roundcube. Click the Compose button.
4) You will then be on the email composition page in Roundcube.
Fill in the To, and Subject fields, then type your email message in the body.
5) When you have typed your email, click the Send button. You email will then be sent to the recipient.