In a previous challenge you researched your instrument. Using this information and the information you already know can you teach someone else about your instrument? You could do this a variety of ways.
You will need to prepare a list of the points you want to explain. You may want to have a picture ready to illustrate what you are explaining. Think about your audience – if they are younger than you the explanations will need to be simple. Perhaps you have a family member who would be interested to hear about this over the phone?
You could write a handout as if you were a teacher in school. Make sure that it is clear to read and has a picture.
Using any software you have can you create a handout or presentation? You might be able to find pictures or recordings online that will help make your presentation more interesting.