Hostmonster uses simple scripts to install various program. Typically they deliver them unmolested, but it appears that they couldn't leave Roundcube alone. After installing, there are some hyperlinks to "Install Roundcube" and "Hostmoster" - a shameless self promo. These are ironic, since I just installed Roundcube on Hostmonster! But I digress. How to clean this up is the point of this article.
Links Removal
To remove the links edit the following file
<mail_base_dir>/skins/default/templates/login.html
and remove the last html line that starts with <p> that has the two hyperlinks to install roundcube and hostmonster.
Logo Change
To change the logo edit the following .png file
<mail_base_dir>/skins/default/images/roundcube_logo.png
The file is NOT sized the html, so you can alter the size if needed. The image does have an inline style for the margin, though.
<img src="/images/roundcube_logo.png" border="0" alt="<roundcube:object name='productname' />" style="margin:0 11px"/>