if you look below the reply box you will see a "QQcode cheatsheet" that will explain how you do all that you want. There is a test forum here, if you want to test it out somewhere besides your post.
Just type in the appropriate code before and after something. for an image you right click the image then copy image lolocation, then type img inside of then paste the image location and follow it up With /img inside brackets. then when you post what you've written it will show the image. Same thing with hiders