The previous answer that says if you've posted your question you can probably post a hub, is correct. However, you will make a few mistakes to start off with. Each hub you post will become that much easier.
I find the best way is to prepare an ordinary, say, Word document and save it. Then bring up Hubpages, and post it a paragraph or two at a time. It's much faster this way, and you don't have to keep stopping in your tracks to think what you're going to write in the next box.
Just keep a look at when you open a box that it's a Text box, if you want to place text in it; a photo box if you want to place a picture in it, etc..
You'll get there.