@mathowie Here's what I see on the website. The "Schedule today" link leads to the signon page. Once I sign on, it takes me back here.
@mathowie Ah, I get it:
1) Schedule an appointment.
2) Choose flu shot.
3) There's a notification that, while you're they're, they'll give you a COVID vaccine if they have one (which they should by the time of the soonest appointments, a couple of weeks out).
This appears to work via either web or app.