By clicking the signup on the website.
No you can make a wiki or account for free
Yes
Wikia Answers is run by a website called Wikia. Although it's confusing, WikiAnswers and Wikia Answers have nothing to do with each-other.
You have to be at least 13 years old to register for an account, or you need to get parental permission. There are no rules against reading or editing wikiHow anonymously, though, if you are under 13.
Mostly. 99% of Wikia wikis allow you to use the same account. The most notable exception is Uncyclopedia. When Uncyclopedia was founded, it was hosted on its own servers. When it merged with Wikia, it already had a large number of user accounts set-up, and could've had problems with multiple users with the same name had they merged their user databases.
Yes, you typically need to activate your Wikia account using an activation link sent to your registered email address. After signing up, check your inbox for the email and click on the link to confirm your account. If you don't receive the email, be sure to check your spam or junk folder. Once activated, you can fully access and participate in the Wikia community.
wikia is a website which allows you to make wikis for free, contribute to wikis, read wiki pages and more
wikipedia
Wikia's population is 127.
Wikia was created in 2004.
You don't have to be an adult to have a wikia... But you have to take your wikia site seriously.
Wikia is owned and operated by Wikia, Inc. So, since they're both Wikia, I guess you could say that.