How do I fix a --- ping?

[Dark Blockland Guard alt.]

In Blockland at this house, people are having trouble connecting to my server because my ping is ---.

How can I fix this?

[Ad Bot]

[Bdarty]

When that happened to me, I opened my ports.

https://portforward.com/
https://portforward.com/guides.htm
https://portforward.com/router-password/
http://www.pcworld.com/article/244314/how_to_forward_ports_on_your_router.html <--Use this one to find the steps

However I don't remember how to do it exactly, it's been a while.