Mikrotik, Metarouter, OpenWRT, AirVPN

[wretchdark 0]

Hi, guys. Trying to do VPN connection on my Mikrotik through OpenWRT for 2 weeks. Mikrotik RouterBOARD 951G 2HnD. I did WAN port on the router (its 1st port), did LAN ports (2nd - master, other - slaves), did wi-fi, all is working. But I need VPN connection through my wi-fi. So I installed OpenWRT as virtual router and used Metarouter for it. But when Im adding some interfaces on OpenWRT its crushing in 10-15 mins, rebooting and crushing again in 10-15 mins.
Asking community to help, because totally dont know what to do now  Ofc I had tried to google it.
The result I want to get: OpenWRT connecting as client to the VPN (im using AirVPN if important) server and giving this connection through wi-fi. And no crushing ofc)

P.S. Sorry for my bad english(

Screens below:

[ulmwind 6]

It is more simpler to use router with OpenWRT.

 

Your problem is not connected with VPN, it is on the stage of configuring of Metarouter. So provide your configuration steps and network configuration.