You could create a text box, and then attach an action to run a macro, which then displays text.
We use this format in the module for a 'help button', which is actually a text object with an image of a help button in the background.
helptext = "QlikView Help"
helptext = helptext+vbcrlf+vbcrlf +"For a general overview of this document, please see the 'Guidance Notes' tab."
helptext = helptext+vbcrlf+vbcrlf +"For additional information regarding each measure, click on (or hover over) the question mark in the corner of each chart."
helptext = helptext+vbcrlf+vbcrlf +"If you require any further assistance, please contact the QlikView team via e-mail."
msgbox helptext,vbinformation,"QlikView Help"
Hope this helps.
Edit: Here is the image we use, but you can use any help button image.