To open a port manually, you will need to access your router or firewall settings and specify which ports to keep open. Each router or firewall will have a different process for doing this, so you will need to consult your router or firewall's documentation for specific instructions. In general, you will need to identify the port number and protocol (TCP or UDP) that you want to open, and then add a rule to your router or firewall to allow incoming traffic on that port.