How do I turn on the VPN on my other devices

When I click the button to turn on the VPN on my other devices, it sends me to the purchase page again?

You need to link your VPN subscription to the other device(s) first before it can be used there:
https://support.brave.app/hc/en-us/articles/13405790544653-How-do-I-add-a-new-device-to-an-existing-VPN-subscription

THANK YOU so very much.