Port forwarding from main ip to external ip on specific ports

[leech]

Hello I am new with opnsense I need  some help,
I want to use this server to act like a proxy,gateway (port forwarding  )for specific ports and can`t figure out why is not working
I want my main ip lan (51.91.25.10) to redirect specific ports (19291, 23000 and 28000) TCP to external ip 46.105.105.3 to act like a proxy server .
or how I can do this ?
thank you