If you'd like to unenroll in the Key Advantage benefit, you can do so directly in your jawnt account by following the below steps:
In the "My Benefits" section of your jawnt account, click Edit for the SEPTA Key Advantage benefit.
On the bottom of the next page, click Cancel Enrollment.
When the confirmation window pops up, click Yes, cancel enrollment.
That's it! You should now see the SEPTA Key Advantage benefit under your Available benefits.
If you'd like to Re-enroll down the road, simply click Enroll and complete the enrollment application.