Leupold deltapoint reflex sight - Leupold DeltaPoint Reflex Sight Matte 3.5 MOA Dot

I have purchased two of these sights and would have given them a 5 star rating but until I'm able to find out how to sight it in, I will hold back 1 star.

I thought when I purchased the Leupold, in reading the information that it had there was a grid on the lens, well that is not so, my misunderstanding. I have searched the web, unable to find much, lots of pictures and YouTube on shooting but nothing that I have found on how to sight it in. I'm guessing there is information, I simply have not found it yet. My question, it has a red dot, where do you align the red dot, to the front sight, when I looked at one shooting with the DeltaPoint 3.5 MOS, it looked like the person would pull the trigger about the time the red dot was somewhere in the middle of the lens, how reliable can that be? When you think it is in the middle. With the normal sights, you align the back sight to the front and then pull the trigger. Waiting on a response from both Leupold and Optics Planet to decide how I proceed.

I like the set up, and purchased the GLOCK G34, Gen 4 with MOS capability so I could mount the Leupold, I just need to find someone that says, this is the way you sight this in, here is where you place the dot, I'm thinking over the front sight, but not sure.