Answer:
Turns out the "link" is actually a form submit button.
All of the forms to "renew" had a HTML class of "manage renew".
You can find this by using the Inspect tool of Chrome (best) or Safari.
See this short video to learn how to use the Inspect Tool.
You might try this in a Execute a JavaScript in Browser action (KM Wiki):
document.getElementsByClassName("manage renew")[0].submit()
This should submit the FIRST "renew" form, indicated by the [0] array element. If that is not it, you can try others by using [1] etc.