Hi autofan,
You claim the cashback directly from the provider once you have purchased the policy. As always, check the terms and conditions for eligibility - it often takes a period of time for the cashback to come through.
If you are having a problem, give our Customer Care team a call on 0845 345 5708 and they'll be happy to talk you through it.
You can also contact them using our website by clicking here.
Hope that helps.