Adding text to confirmation page generated by Remove Email Verification plugin

Here is the text generated by the plugin Remove Email Verification
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Hello tester, your account has been created!

Username:tester

Password:abcdefghi

You can now update your details by going to the admin area of your account or go back to the homepage.
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I want to add " PLEASE COPY THESE DETAILS"
Where do I do this?
Thank you