GL AR300M VPN

I'm trying to set up open vpn wireguard with a vu+ uno4k receiver and I'm not getting anywhere. I only want the receiver as a vpn, if I set it up on my computer I have vpn on my router and not on the receiver, how do I set up vpn for just the receiver

Login to the router, go to VPN Dashboard > Global Proxy and play with those settings (eg. add the Mac or IP of the receiver).
However, most firmwares for the Vu+ already have Wiregaurd pre-installed or downloadable as a plugin/extension, so you could add a client direct on the receiver.

Can i then deled my nuc Computer when i do Proxy server

No idea what you are asking but you don't need anything on your computer - setup Wireguard on the router OR Vu+.
That's it!

If the receiver is on the router LAN, I don't have to set it up via computer? Also VPN CyberGhost, I thought it would be easy to set up in the router,

If your router acts like the VPN gateway, no other device needs to be connected directly to the VPN. The router will handle all.

How do I proceed in the router if I only want to set up the receiver, which device should I use to set it up, not the computer?

I don't understand your question.

Every VPN client needs an provider / server.

sorry, where in the router and with which device should I set up the receiver? I set it up with the computer and have VPN via computer

Which device should be connected to which other device?

Please explain your setup.

vu+reciever with cyberghost vpn

In that case set up VPN client on your AR300M and select the VPN policy "By MAC" and select the receiver there: VPN Policies - GL.iNet Router Docs 3

Or just set it up on the receiver using the remote control and send any necessary files over to the Vu+ using WinSCP - loads of guides if you do a quick search