Can I use an HP stylus in Adobe Acrobat for more than highlighting and selecting? I can't enter information in fillable areas with the stylus.

I've been asked to create an instructional training about using the HP Active Pen G3 to perform a variety of tasks for our investigators,

I am able to use the pen to highlight and select things or activate in a form an area to enter information to in Adobe, but I am not able to use it to sign or annotate the documents.  I can't write in the various fillable options in a form using the stylus.  No pop-up keyboard appears ever to be able to use to enter in information.  I don’t see an option to use it to enter text anywhere.

I don't know if I am missing something obvious, but is there a stylus mode within Adobe Acrobat?  I thought the stylus pen would have more functionality to it within Adobe.  It appears to be unable to be used to fill in portions that I am allowed to type in.  Can anyone tell me how to use the stylus to be able to fill in areas of a fillable form designated for text?  Thanks in advance.