:You are required to have a Wikipedia account to create a new article - you can [[WP:SIGNUP|register here]]. (To see other benefits to creating an account, see [[Wikipedia:Why create an account?|Why create an account?]].)
:For creating a new article see [[Wikipedia:Your first article]] and [[Wikipedia:Article development]]; and you may wish to try the [[Wikipedia:Article wizard|Article Wizard]]. For creating a new page in your userspace see [[Wikipedia:User pages#User pages and user space|How do I create a user subpage?]]; or use the [[Wikipedia:Article wizard|Article Wizard]], which has an option for that.
:The best way to find out is to look at the [[Special:Log/delete|deletion log]] for reasons (type the ''exact'' name of the article in the Title box, including the capitalization you used). For more information, see: [[Wikipedia:Why was my page deleted?|Why was my page deleted?]]
:You [[Help:Moving a page|move]] the article using the "move" button (to the right of the "edit this page" button). But in order to do this you must have an account that has reached [[WP:AUTOCONFIRMED|autoconfirmed]] status, meaning it must be at least four days old and have made at least ten edits. If you are not an autoconfirmed user, or the move is controversial, or the page you wish to rename is [[WP:PROTECT|move protected]], visit [[Wikipedia:Requested moves]]. You may also [[Wikipedia:Requests for permissions/Confirmed|request]] to have an admin grant you confirmed status.
:For changing your username see [[Wikipedia:Changing username]].
:Almost all articles on Wikipedia are written by multiple editors, not just one. If you click on the "[[Help:Page history|View history]]" tab at the top of an article, a list will be displayed of all the contributors to the article and when their contribution was made. If your purpose is to cite Wikipedia, see the question above. See [[Wikipedia:Who writes Wikipedia|Who writes Wikipedia]] for further details.
:See [[Wikipedia:Overview FAQ#Who owns Wikipedia?|who owns Wikipedia]] for details.