To sign up for the Amazon affiliate program, visit afiliate-program.amazon.com and click on 'Join Now' in the top right corner. Fill out the required information, including your name, email address, tax identification number, and bank account details. Next, browse through Amazon's advertising options, such as Display Ads or Video Ads, to determine which type of ad suits your content best. Choose from various ad formats, including product grids, detail pages, and more. Once you've selected your preferred ad format, click 'Get Your Links' to obtain your affiliate links for promoting products on your website, blog, or social media channels. Amazon will provide you with a unique affiliate ID, which is used to track referrals and commissions earned. It's essential to read and agree to the terms and conditions of the program before proceeding. By doing so, you'll be eligible to earn commissions on sales generated through your affiliate links.