To claim your splits (this will also claim for you all your past and future races where you used the same e-punch) you should go to the splits from Interscholastics on Attackpoint. When you find your name, there should be a question mark next to it. Click it and it will ask you for your e-punch number. Enter that and submit, your splits will now be listed under your Attackpoint name as a clickable link.
Thanks, Thomas. Where exactly am I entering my e-punch number?
You can associate your current si-card in your AP profile.