1- First of all select a forum/channel from where you want to start a thread/topic
2- Click on "New Topic"
3- Enter a Tittle for your thread
4- Then start to write your thread/topic post.
you could be able to add media like images,videos,etc... in your thread
Click image for larger version

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Click image for larger version

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post your thread by clicking on post button.
if you want to preview once before posting your thread,click on preview.