How do I separate objects using the mirror modifier in Blender 2.82?

Question

I looked up the question already but they posts are from 6 years ago and the steps are outdated. The problem is that I added a mirror modifier to the shins and feet of my character. The question i how do I make the mirrored part an individual object. I have tried adding an empty axis but it didn't work the way I expected it to. When I select one, both are selected. Thanks]1

I put the bender file https://blend-exchange.giantcowfilms.com/b/vzkE2NsZ

Answer 1

Go into the modifiers tab, and press Apply, on the Mirror Modifier. That will convert it to actual geometry.

Then, in Edit Mode, select one half of the object, and press P > Selection. This will make it into a separate object.