Removing price from memberships but keeping different access levels

I need to have 2 different access levels but neither of them will cost the user anything to sign up. I have set the price to free but when the user gets past the username/password portion of the sign up it says "Please check the details of your subscription below and click on the relevant button to complete the subscription." However the only field available is a coupon code field and the only button is apply coupon. Just curious if you could point me in the direction of or let me know if it's possible to change this so there is no cost for each access level initially for the user.

Cheers,

Stephen