What is an Instagram link in the bio?

The clickable URL you may add to your profile area is the "link in bio," which is exactly what the name says it relates to. On most social networking networks, you can include a link in your bio that can direct your followers to your website, product page, content, or another significant page.

Why use FS Poster schedule website post link to Instagram bio feature?

FS Poster lets you schedule and automatically share website post links to your Instagram bio! You can enable this feature on the Instagram settings part of your plugin easily.