How do I create hashes.json for changes in an addon

I paid a developer to create an addon for me and I have made changes to within the addon itself so the hashes.json file is all wrong. So I was wondering if someone could spell out for me in very simple terms how can I create a hashes.json file for the addon that now has the changes in it. Please please in very simple terms like step 1 do this, step 2 do that

Your help is appreciated

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