You can reply to your messages not only from your phone but also from the web.
To reply to a message on the web:
- Log into your account on the YouMail website
- Click on Messages on the left hand side and select Inbox
- Select the message that you would like to reply to and click the 3 dots located on the top right
- Click the “Reply” and select whether you wish to reply by email or text, enter either the email address or phone number, type out your message and hit "Reply"