After you fill out the federal return you fill out the state return. Then when you efile state the fee is $25. The $10 credit will be automatically applied so you only get charged $15 on your credit card. That's how my Costco worked. It knows you have the $10 rebate. \
Have you installed the program yet? Did you download and activate the Desktop program with the 16 digit License Code?
How to get started with the Desktop program, install and activate it
https://ttlc.intuit.com/turbotax-support/en-us/help-article/product-delivery/download-software-turbo...
