Wikipedia discourages outing, especially as it can expose people to danger and violate their right to privacy. When adding an LGBT category or adding to an LGBT list for a living person, you should confirm they are publicly out - via a citation to a reliable source.
Wikipedia's style guide says to refer to individuals by their latest expressed gender self-identification throughout the article and for any phase of that person's life, unless they have indicated a preference otherwise. A trans individual's deadname should not be included in an article, unless they were notable under that name, eg. Chelsea Manning or Elliot Page, and it should only be mentioned once, in the header of the article. The policy of including deadnames for individuals famous under a previous name has been heavily criticized and is ethically questionable.
In some circumstances, such as frequent vandalism, pages are protected from modification by certain groups of editors. There are several levels of protections. Some of the most common are pending change protection, where changes must be approved, and semi-protection, where anonymous and newly registered users cannot edit. If you are new to Wikipedia, you may need to build a history of editing before you'll be able to edit such articles.
Any user may request protection for an article, especially one that has been vandalized.