Adobe Sign Form & check box function

Hello! I need help...I have an Adobe form that I converted to Adobe Sign. Everything works good except I cannot figure out this piece...I have a checkbox that if it is checked I want a signature field to become visible and the rest of the form (8 pages of fields) to become invisible. Back story on my form is that I either need someone to fill out the 8 page form, sign & return it to me or check the box to decline, sign & return to me, it does need to remain secure/private. Is there a way to do this? I have searched & searched and feel that I may be missing something. Any help is much appreciated. Thank you!