Need to do it in the threads already made, (profile posts dont count). like this https://forum.novelupdates.com/forums/general-chat.947/. pick a recent thread, click and scroll down to the bottom and post a relevant response to the topic of discussion. repeat process on 4 other threads
Status posts don't count as real messages, so you still won't be able to make a thread. I recommend going to threads and commenting there