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UPnP (Universal Plug and Play) and NAT-PMP (Network Address Translation Port Mapping Protocol) allow devices on a network to automatically configure port forwarding rules on a router. This enables devices to communicate with each other and access services on the Internet. For example, UPnP and NAT-PMP can be used to:

Allow game consoles to connect to online gaming services
Enable video conferencing and online meetings
Allow devices to access remote servers and services
Facilitate file sharing and peer-to-peer connections
Security Considerations

While UPnP and NAT-PMP can be convenient, they also pose security risks. Any program on the network can allow in and forward any traffic, which can be a potential security nightmare. It’s essential to carefully configure UPnP and NAT-PMP settings and ensure that they are only enabled when necessary.

In conclusion

UPnP and NAT-PMP are two protocols that allow devices on a network to automatically configure port forwarding rules on a router. Many routers support these protocols, including Siretta, pfSense, Linksys, Apple, and other brands. While they can be convenient, it’s crucial to carefully consider the security implications and ensure that they are only enabled when required.

(in short, just disable the protocols. A cursory web search on how to do it for your make / model should produce enough info for you)

it means you should log into your router and disable that

You dun goofed. You’re gonna get backtraced and the consequences will never be the same.