Port Forwarding, access with Winbox and other issues

Hello, I am having a lot of trouble with my router at the moment. It all started with me trying to port forward, but I struggled a lot to do so with RouterOS, so I tried using Winbox, but Winbox cannot access my router. My router IP as displayed in Winbox does not allow me to connect, as I use the IP 192.168.101.1:8081 to connect with Webfig through internet, but the IP displayed in Winbox does not include the 8081. I have also tried using the Mac Address, but to no avail. Furthermore, I just want to port forward port 25565 on TCP and UDP, but when I try to, the ports dont open to the public. Can someone please help me to port forward and to maybe fix my Winbox access?