As you can see, editing Wikipedia pages involves three steps:
Step 1: Click Edit
Above each page is an Edit button. Watch:
Step 2: Change the text
If you clicked Edit, an editing screen will appear with the page below. Type in the edit screen to change or add information.
Step 3: Click Publish Changes
When you're done editing, you can click the Publish Changes button at the top of the editing screen:
If you clicked Publish changes, your changes will now be visible to everyone, anywhere in the world! It is good practice to also briefly describe what you have changed or why the change was made. This helps those checking the changes. The description is also visible in the edit history.
No registration is required to help write, correct and expand articles; you can get started right away. But those who want to (and are encouraged to) can easily create a username.
Publishing with your own account has a number of advantages:
you can rename articles,
you can edit protected articles,
you can easily find your contributions,
you can keep an eye on articles on a watchlist,
you can send and receive email,
a username facilitates communication with other users. Note that you only need to request a user account once; the same account can be used in all Wikimedia projects.
Edit source code
In addition to the standard visual text editor, it is also possible to edit a page with wikicode.