After watching a hint video (EZpdf for cross stitch) it does look rather cool in that it could FIND all instances of a color/symbol.
However, I'm only seeing it for Android or Kindle Fire (which is a sort of Android).  Or for iOS.  Oh, I see you are using a Kindle Fire and not a straight-up-kindle.  If we have a Kindle FIRE section in this forum, you might get more help there.