To add an affiliate link on a website, start by copying your unique affiliate URL from the affiliate program or network. Then, open the page or post where you want to add the link. Highlight the text or image that you want to use as the clickable link. Next, use the website's editor to insert the affiliate link by selecting the "Add Link" or "Insert Link" option. Paste your affiliate URL in the link field. Make sure the link opens in a new tab for a better user experience. You can make use of plugins to insert the affiliate links to your website. And the popular one is AMASP. You can then publish the page or post to make the link live.