First and most important is to make sure you have liberally greased (or used a good amount of pan spray) the inside of the bundt pan. If it still doesn't come out, try flipping your bundt pan over onto a clean surface or a cake plate (the cake will be touching the counter. Wet a dish towel with hot water (ring it out) and place the wet dish towel over the bundt pan and let it sit for 1-2 minutes. Wipe any water that may have gotten on the counter or plate, then gently shake the bundt pan to release the cake. Waiting too long to get the cake out of the pan will cause it to become damp and stick to the pan.