What is your question...do you want a canopy, are you having a problem with yours, where to put one? Please re-post your question so we can help you. Would love to help.
Here are some cool ideas https://www.buzzfeed.com/ashleymcgetrick/slumber-party-for-one?utm_term=.lf8j6BE8e#.tfV3MEpmN
You could attach a hula hoop to the ceiling and drape tulle fabric from it, down around the bed.