First of all, a basic knowledge of port forwarding and it's requirements are good for this. See this Port Forwarding Guide or search Youtube for up to date port forwarding guides for your hardware.
A good tool to use to check your ports is Can You See Me . This website will use your global IP and check if the port you specify is available. For SimSig, the Primary port is 50505, so, after starting up a multiplayer sessions, enter 50505 in the port, and check if this is showing.
If not, recheck your port forwarding settings.
Last edited by C.Gillibrand on 14/11/2022 at 12:44