GoComics Premium benefits are available as either a monthly or yearly charge. If you select the monthly option, you are welcome to upgrade/change your subscription selection at any time.
If you are a monthly member, and wish to become yearly (for the flat rate of $19.99), simply select "upgrade to yearly" in your subscription area. You will be charged as a yearly member at the end of your current monthly term.
If you wish to downgrade to a monthly membership from that of yearly, you will need to either select to "opt out of renewal" for you current yearly membership, and at the end of your current membership, elect to renew as a monthly premium member, or you may contact support for further assistance.