[Plugin: Shortcodes Ultimate] Custom Members-Only-Content Login Message?

Hello, thanks for your awesome plugin extravaganza.

The default Login message displayed for member-only content ends with “Please Login” and I would like to add “or Create an Account” but can’t figure out what file generates the message.

Could you please help point me in the right direction?

Thanks!

http://wordpress.org/extend/plugins/shortcodes-ultimate/