Edit iptables in docker container?

I’ve been using MineOS-node for quite a while with no issue, as a docker container in UnRAID. I’d like to run multiple servers simultaneously, which means I would need to open more ports. I have been unable to do so. I have tried to access iptables through the console provided in the docker, but the command is not available. Combing through forums and websites yields help for TrueNAS or FreeNAS, but their instructions haven’t helped my case. Any help or tips would be greatly appreciated.