Please Help: Direct Quantity Taper with Fixed Percentage

Hi. I am trying to work with Jim Hawk's application program. I want to start a direct quantity taper of my 1.5 mg Kolonopin per day. I may switch to a liquid taper at a later date. When I put my data into Jim's application I am able to do a fixed quantity reduction per day. However, I would rather do a fixed percentage reduction per day, but whenever I select that option, it won't give me the taper schedule and the associated graph and printout. It gives me nothing, basically.

Can you do a fixed percentage reduction with direct quantity or can you only do a fixed percentage reduction with a liquid taper?

Any ideas on what I am doing wrong would be greatly appreciated. Thank you!!!!