If you want to share your own experiences, I recommend writing a blog post. People will read it and react to it. If it's a thought or observation about MDD or this community you want to talk about with other people, write a discussion. There are also groups dedicated to specific topics. If you post something there it will be likely to be received by people who are familiar with your experience.
If you don't like the concept of typing a text that others could than read, than I would recomend just showing up in the main chat whene people are talking there. We talk about all kinds of things in the chat, both serious and silly stuf ;) You can share pretty much everything there.
This site can be a bit of a mess but I hope you can figure out how to make use of it in the way you want. :)

Welcome to Wild Minds Network Annette!