You can't. In order to play with them, you need to be on the same platform and, within that platform, on the same map. It is probably best that you ask them to guide you to start a new haven on the same platform and map on which they are playing.

Hello Crowbar, I asked them but they still entered Gameroom, and we don't know how to do it, please help me, thank you  

I never had a FB account. I'll ask my Plarium contact, but they probably won't respond before Monday.

Happy Sunday Crowbar, thank you very much for your interest you are really kind, I look forward to an answer again a thousand thanks  

Sorry to keep you waiting. I finally got my answer. It's not very encouraging, but it should be doable.

There is no official way to join the game on Facebook. That requires a browser and the game officially doesn't work in browsers anymore.

However, there is an unsupported way to use one: you need to use Puffin browser to be able to start your account on Facebook, which you do here. Your friends will still have to tell you which map they're on.

Once you're there, you should be able to migrate to Plarium Play following these instructions. The game will show as a separate Pirates game with Facebooks logo, unlike your current one.

Alternatively, you can keep playing using Puffin, but it's a paid-for browser, and the gift codes we sometimes get are not supported when playing outside of Plarium Play.

Good luck!

Hi Crowbar, thank you very much for your answer, I will try to do so let's see what I can do, if not patience I will continue normally and make new friends