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You add a port to the public zone like so:

```bash
# firewall-cmd --zone=public --add-port=8080/tcp
```

Firewalld knows already many of the commonly used ports, so you might just use the service name instead:

```bash
# firewall-cmd --zone=public --add-service=kdeconnect
```

These changes won't persist over restarts. To make them persistent run:

```bash
# firewall-cmd --runtime-to-permanent
```

Or you might have used `--permanent` option in the original commands, but usually it's good to test your changes first.

Official docs: https://firewalld.org/documentation/howto/open-a-port-or-service.html