Changing a dimension in fusion 360

how do I change the diameter of a circle when designing in fusion 360?

Edit the sketch. Hit [d] for dimension. Select the circle and you will see the dimension of the circle as you pull the mouse pointer away. Click on the dimension and enter what you want it to be.

That is one of about 5 ways but it is very precise.

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thank you very much

You are very welcomed! Welcome to the forum.