https://slips.comenter your phone number to make a Free Slips account. Then go to your profile page at this link, click promos, click add promo, and enter code: PRES10 to get $10 added to your account. Then go to the presidential election section on their main page, make your bet selection, and make the bet. It will show a fee but that’s covered with your credit as well.
You can do this all through their website, or you can download their app.