Editing Draggable Elements in Upfront

I'm new to upfront and I'm trying to create a custom site. However, I'm having a lot of trouble editing the Login Draggable Element. Is there an easy way for me to change the color of the login button? Can I change it so that username is in the textbox instead of a label above it?

On a more general note, is there a video tutorial or instruction pdf to help people learn how to use Upfront?