I need to renew my subscription but I am not sure what button to push. It has to ways of purchase. 2CO or the regular I have no idea what that means,help!!

I could be wrong but I think one is for renewing your subscription (if you have an existing membership you renew now for an even bigger discount!)and the other button is for buying a subscription (if you are not currently a member.)

It doesn't matter. I think one way you have to sign up with your credit card info and then you can use it in many places (2CO).
The other way you just use your credit card.