Welcome to the GTA Myths Wiki help page on editing, the most common activity on any Wikia site.
First, register an account if you haven't already. It's mandatory to edit on this wiki, and will help you tremendously should you decide to contribute on other Wikia sites.
We also advise that you access your Special:Preferences page and chose either the "Source" editor or the "Classic rich-text" editor. This is because of the large quantity of special templates used on the site, which either become broken or aren't changeable when using the default Wikia Visual editor.
To begin editing, simply press the large green "Edit" button visible at the top of all pages. You can also press the small  button located to the right of all headers to edit only that section of the article, which can come in useful on articles with vast amounts of content. When editing on PC, pressing the "E" key serves as a quick way to begin editing.
Things you will be editing
Here are specialized Help pages describing the various things that are used when you are editing an article:
Fandom's help guide
Here you can see the default help guide created by Fandom and included by default on all Wikia sites, which also contains numerous links to Community Central; where you can learn more complicated wikitext.