how do we replace the old lens; do they just pop out, and insert these. Do they snap into place?

That is correct just push on the upper corner on the nose piece side

Do these lenses have the ansi z87 stamp on them?

Thank you so much for your question. Sorry there is no stamp of Z87. Have a nice time! MryLens

What percent of blue light does it block?

I have no idea. It doesn't appear to be very photochromatic.

Do these lenses Go from daylight tonight do they change

Yes, that's what photochromic means

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