On the Teams & People page, people are listed along with a short bio.

To create or modify your "About you" section, select "Preferences" from your avatar menu, and then go to "Profile" and scroll to the bottom of the page.

In the "About you" section, add any relevant info that you want others at your company to know about you and your work.

You can also use the rich text editor to format your text and insert links. Highlight the text to expose the toolbar.