This article is written by our customer Krishna Priya Praveen.
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I have been wanting to do this post in a long while and today seems like my lucky day 
It's impossible for me to shoot a video of putting the diaper on my wriggly bub, so am going to do the same over a few collages. Please read text under each of the images for description.
PS: All images shot by me while putting the diaper on my sleeping bub, it's quite a task to not awaken the bub! Phew....
The images show how I have folded the insert such that I have maximum absorbency in the front for a boy baby. Once folded, I pull up both the wings over the insert before I snap the shell.
First I snap the waist snap on either side, the pull up the shell a little and snap on the hip snap. The bottom image shows the snap settings used roughly before tightening.
1. Image shows how the diaper fits on the bub after rough snapping
2. Since there is a lot of slack, I work my way from the back, all along the the elastic and gather up the slack. The pinched fabric is the slack. I pull the fabric in a downward direction.
3 &4. I pass my fingers in the rise area and point them upwards and push the excess fabric upwards. This gives a snug fit at the leg elastics and thus prevents leak.
5. I also ensure the leg elastics are gently pushed into the leg crease and not lie on the thighs.
Images 1,2&3. I check for the fit at the waist. Since I found it gaping, I tightened by one snap at the waist on both the sides. I check the fit is not too tight and make sure one "fat" finger of mine can slide in without much force along the leg openings and back elastics(no image). This is how I like the diaper to fit so as not to leave ugly marks.
Images 4&5. Final fit of the diaper from the front and back 
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Hope this tutorial helps you achieve a good fit on your Bumpadum diapers. Leave a comment below if you have any questions! :)