Hi Salam and Welcome to NeuroTalk.
I moved your post for you.
If you click on the main forum name, like Colloid Cyst ( it will be right above the NT toolbar and is underlined), that will bring you to a forums main page. There is a button to the left that says New Thread. Just click that and start a new thread.
Let me know if I can be of any help navagating the forum.