If you are not logged in, you will see this lock sign with the word "View Source" on most pages. Log in or create an account to fully experience Wikia. If you are logged in, however, then you will see this pencil sign with the word "Edit", meaning you can edit.
Before going further, here are things that you might want to do:
Make sure to read the policies for general wiki rules and consequences.
Tell the community a bit about yourself on your user page. However please do not share your personal information.