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Wikipedia editing is easy; you don't even have to be a registered user (although you may want to register). There are three steps:
Edit tabOn the article you wish to edit, click the Edit tab on the top-right corner. Note that some articles may only be editable by established registered users, but you can edit the vast majority of articles.

After clicking the tab, you will be directed to a page that allows you to change the content of the page. Before the implementation of VisualEditor, editors had to deal with complex syntax, but now, you will be redirected to a WYSIWYG (what you see is what you get) editor similar to a word processor. Formatting, heading, and linking are available at the top of the editing interface.
However, since VisualEditor isn't available on talk pages (more on that later), you may want to learn basic formatting:
| Formatting | You get |
|---|---|
'''Bold text''' | Bold text |
''Italic text'' | Italic text |
[http://example.com Example] | Example |
[[Nature (journal)|''Nature'']] | Nature |
[[File:Example.jpg|thumbnail|caption]] | |
<ref>Example footnote</ref> |
Once you are finished, click Show preview to see what the changes would look like, enter a descriptive edit summary, then click Save page.
Be bold! Don't be afraid to save, and don't agonize about making mistakes; edits can be undone at any time. If your edits are later undone, discuss with the editor who reverted it. Edit warring (basically an "undo war") is detrimental to consensus-building.
You know how to edit articles, but how about discussing edits with other Wikipedians? Wikipedia facilitates such discussions using article talk pages (for discussing individual articles) and user talk pages (for contacting users). On the top of an article of user, click Talk to be directed to the corresponding talk page. Add new comments by editing a section directly (there is a Edit section link for every section), start a new discussion by clicking New section on the top of the page. Reply to discussions by indenting; one colon per indent at the beginning of a comment:
Remember to sign your comments; add ~~~~ to the end of every comment.
On Wikipedia, editors must respect policies and guidelines accepted by the community.