Hi Cotton!
Your username is showing up as Cotton, so that seems to be fine.
On the forums page, right above your picture (or where it should be) there's a row of tabs that will help you navigate the forums section. When you go to create a new post, there will be a pull-down menu at the top from which you can choose the category you want your post to fall under.
The top row of tabs, all the way to the right, there is a profile button. From there you can update your information, upload a picture, as well as many other things.
This is just for starters, and if you need anything else, don't be afraid to ask. As CC's original post states, there are at least half a dozen "veterans" on hand at any given time who are more than happy to answer questions.