You can make changes to your membership for the next season (Spring: Apr-May). Your invoice will be adjusted to reflect the changes. If the invoice amounts change, your balance will reflect the addition or subtraction (remember, a negative number is a credit balance.)
If you want to make changes for this current season (Fall: Nov-Dec, email Phil at email@example.com. This will insure that the right pro-rated adjustments are made to your current invoice. If you have questions, call him at 612-308-2664.