Hello @FirstNameL040670 ,
How exactly do you want people to be able to enter into the giveaway? If they need to submit info - such as name, email, etc. you may want to have your button link to a landing page sign up form that you've created. If the contacts need to navigate to your website to submit, then you'd want to have your button link to the relevant webpage on your site.
For full instructions on adding and linking buttons in emails
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