How to bend a new chastity belt
The key to comfort in steel belts is that you need to bend the belt to adjust to your body the first few times you put it on. After you get the bending just right, it will be very comfortable.
There used to be a great article on bending lockmeup.com, but that forum is dead and gone.
First of all: Question #1: Is the belt made to accurate measurements of your body? If you bought the belt off of eBay or elsewhere and it was not made for you, then there is little chance that it will ever actually fit you well. Sell it and put the funds towards getting a belt made for you, if you still want to go there.
Let's say that the belt was indeed made for you. The process will take about a week or two of daily wear-and-bending sessions.
Wear the belt for a bit, note where the pressure points are, then take it off and bend it.
Don't wear the belt for more than half an hour or you will feel chafed and sore because there will be pressure points.
A good solid edge an inch or two wide is all you need to bend the steel. It's really thick metal, so a sturdy chair back, the back of a sofa are the sorts of surfaces you need. I like to use the foot of my bed. Put a towel on top of the surface if you don't want to scratch it.
The first part of the belt to address is the waistband. If you put on your belt right out of the box, you'll probably notice that it pinches you at the two flanges of your pelvis in front of your body. You want to bend the waistband so that it becomes a rounded capital D shape with the flat part of the D being the front.
The second part would be the front shield. It sounds like you have a penis tube, so that's what you are going to have to adjust it into position for. Think of the front shield as a shallow S shape, and you'll just have to figure out how to adjust the angle and the height of the tube so that it fits over your trouser snake just right.
This second part can be very frustrating. The angle's right but the height's too high or too low, or vice versa. Stick with it, and soon you'll get it right.