I newly subscribe a vpn service and I want to configure it on my Mikrotik router. I do not have a technical knowledge to make a setup on my router. So please suggest me a good guide. Thank you.

There are no guides that I am aware of and MT routers are not plugNplay. Unless you know how to configure them with some confidence, i would proceed very slowly.
What service did you procure (nordvpn for example?) Also who recommended the router - as its not a typical home router..........