Question please @demania

I am new to demania. I have problem not understand it: when I am on my steem account here and find demania post, I click on ( view post in demania) , I am transferred to main demania app /page .. I am asked to authorize demania to ( take my voting role) before I can continue! Which I don’t understand. Is it a must I authorize demania taking my posting and voting role??
I appreciate your help to make me start !
@josteem