How do i install a vpn on dreamlink t1 plus?

Home->Market->Local->All

Scroll down toward the bottom of the list & you'll see several VPN apps. I've used Private Internet Access with the T1+ but there are other good ones including a free Cloud VPN app. (Cloud VPNs are considered to be less secure.)

I use ExpressVPN installed in my router but can bypass it & use PIA if I wish.

Good luck.