When asking a question at the Help desk or the Reference desk, please include all the facts needed to answer the question. For example, do not ask "who was president in 1900?" without mentioning the country you are interested in. This prevents the volunteers of those departments from having to ask follow-up questions before providing answers. Friendly reminder: the Help desk is for questions on how to use Wikipedia, while the Reference desk is for questions about anything else (real world questions).
If you would like to edit Wikipedia, just click the [Edit] tab (to use VisualEditor which is a WYSIWYG editor) or click the [Edit source] tab to use the Wikipedia text editor. Both tabs are at the top of the desired page or page section.
To create a new article, type the name of the topic in the search box and press ↵ Enter. If a page doesn't already exist with that name, Wikipedia will let you create one. Follow the instructions on the screen. As an alternative, the Wikipedia Article Wizard helps you through the process of submitting a new article to Wikipedia. Redlinks are another way to create new articles. Mouse click on the red link and Wikipedia will let you create a new article with that name.