The option to put a photo next to your comment is open to everyone. In addition, if you’re a party member you can also have this indicated when you post a comment.
It’s very simple. You just need to register for our online forum and get a username and password. Then in future before commenting, login with your username. (On most devices for accessing the internet, you can turn on the setting for your login to be remembered so you do not have to do this each time.) You will then see the party logo appearing next to your name when you post up comments.