plzzz help me...

guys plz help me.as i don't how to do it.😊

1.how to post a picture n a topic?
2.how to post a vedio?i don't want 2 post a link.koi vedio post karne k liye kiya oo vedio download karna zaroori hai?koi link se kiya vedio direct post karna possible hai?
3.how to post a song on a post?