Here are the hoops your user will have to jump
through to stop the warning page from appearing every time they go to your site.
First, they will see this page.

Your users need to click on Continue to this
website (not recommended)
They will be presented with the red Address Bar and certificate warning:
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Click on the Certificate Error button to open the information window.

Click on View Certificates. Then click on Install Certificate.
You'll see yet another warning.

Click on yes, then you're done.