Delete some steps from health app

When you go to the Health app, you can go to Steps, then scroll down to the bottom and you can see a place to "Show All Data". Tap on that and you can see the steps for a particular date, then tap on that and you will see all of the entries for that date. Tap on Edit in the upper right corner of the screen and you can edit.

And I provided you with the method to do that. What is your problem now?