So I’ve recently started using Shapr3D on my iPad, and learned that it is not a history based Modeling tool. I can’t seen to figure out how I can make some angle changes to the body if my sketch changes don’t apply.
I’ve included a screenshot of the body, I hope I made it clear! Any help is much appreciated 
It seems that you have already created a union of different surfaces. Is the main body a single object?
First, you should consider adding all the fillet radii at the finished stage of your design. Or, you can make a backup body without fillets for the purpose of making mods.
After removing the radii, there are a couple of ways to change the angle. The first is to use Move-Rotate and the other is to delete and recreate the desired addition (2nd video).
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