Once your webinar has been created you can find in the Registration section while editing your webinar.
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When you created the event, a default registration page was created for you automatically with placeholder contents. You can go to "Registration" and then edit the content by clicking here
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If you want to change your registration page, then click here
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Please note if you change your template, all your contents that you might have edited for the Registration Page, will be lost and they cannot be recovered.