Popup Text Code Question

First, may I ask on here how to code something? I really don't know how and
I want help. I do have examples.

I want a link that will open and close a popup with text that a screen
reader will read. The top button on this URL is an example, but instead of a
button, I want a link:

http://codetalks.org/source/widgets/alert/alert.html

Sincerely,
Ryan Jean

Assistant IT Specialist

The Disability Network

Flint, MI