Wikipedia has been helping to provide millions of people with information on every subject imaginable for years. The beauty of Wikipedia is that it is created and edited by the users themselves. For some, it may seem difficult to create a page on Wikipedia, but in all reality, it is pretty easy to accomplish.
The first thing you need to do is go the Wikipedia site and do a search on the topic you are interested in writing about. If your search does not yield any results, then you are able to create a new page. Following this, you will need to create an account with a username and password. If you do not want to do this, then you must remember that unregistered users and registered users alike can submit articles for review, as well as publishing under the tab for Articles for Creation.
Wikipedia stands strong behind the belief that the chosen subject must be a worthy subject and use to others. If your chosen topic is something you would find in a reference source, then rest assured it is okay to write about it. If you are in doubt, then you can check the article viability under the tab Wikipedia Teahouse. Here you can ask questions about issues you may have.
As stated previously, if your search reveals no results, you may need to search it under a different name. On the other hand, if your search reveals that the article is in existence, you are free to add to or edit subject matter.
Take some time practicing your penmanship. A good place to start is to look at a few writing samples from Get Your Wiki before penning one of your own. There is a tutorial on Wikipedia to gel you with writing your first article, so feel free to have a look. Make sure you gather information from reliable sources only when writing on Wikipedia. You want your article to be of quality.