I go about a cm. Deep, no more than my pinky finger knuckle deep. Drop in the seed. Lightly brush dirt over hole, do not press down on the dirt. Once the whole is covered use a pipette plastic dropper to apply about 2oz/20ml of water around where the seed is. Using the dropper allows you to get everything yet without damaging the soil with water coming out of a cup or bottle, that can push your seed down further.so I recommend the dropper. So after adding my water I will cover the area I planted the seed with either saran wrap over the whole pot or recently I've been using clear solo cups as humidity domes for the first couple days until my seedling becomes established then I remove the domes.
While your waiting for your seed to pop you may have to once a day spray a mist under your humidity done and make sure the top soil that's under the dome stays moist and doesn't dry out. Hope this explains things well, I just woke up and haven't medicated lol