Signing up for affiliate programs is simple. You need to choose a program that fits your niche. Many companies offer affiliate programs. Visit their website and look for an "Affiliate Program" link. Click on it and read the terms. You will often find a sign-up form. Fill in your details and submit the form. After approval, you will receive a unique affiliate link. You can now promote the company’s products or services. When someone makes a purchase through your link, you earn a commission. Always check the affiliate program's requirements before signing up.