Yes you can.
First cancel your existing membership. (Don’t worry. All your information is safe).
Next click on Become a Vendor on the Account information page and choose the membership plan you want.
All information will be present. Just click the checkbox to accept the vendor terms and follow the instructions on the screen.
Please Note: When switching to a new membership, the first month free offer is not valid. It is only valid the first time you sign up for a membership plan.