Message Custom Field for providing further info

[rmax]

We have a request type with fields which users fill in on the service desk.  We wanted to add an information table or if this is not possible, information as a text above a new field we will add.  The information is to describe what the values for the new field mean so they know what to select.  I have created a Message Custom Field (for view) but it is not working.   

1- Do I need to use For Edit if it's for this screen? 

2- How can I have a box that shows this information as a table or formatted text?

Thanks in advance