Instagram allows you to include clickable links in the following area(s):

The website field in your Instagram profile is the only place where you can include a clickable link. This is a key limitation of Instagram for businesses and marketers, as it funnels all external traffic through a single point. While you can type URLs into captions, comments, or your bio, they will not be clickable. The custom location field is for geographical tagging, not for clickable links. The username field is for your unique Instagram handle and does not support external links.