Be Bold In Updating Pages

From KayakWiki

Wikis don't work if people aren't bold. You've got to get out there and make those changes, correct that grammar, add those facts, make that language precise, etc., etc. It's OK. It's what everyone expects. So you should never ask, "Why aren't these pages copyedited?" Amazingly, it all works out. It does require some amount of politeness, but it works. You'll see.

OK, you folks still don't understand, so let me make this clear: if someone writes an inferior or merely humorous article or article stub, or outright patent nonsense, don't worry about their feelings. Correct it, add to it, and if it's a total waste of time, delete it. That's the nature of a WikiWiki.

So I might have convinced you to be bold in updating pages, but now you want to know: How do I edit a page?