Hi!Edit
Welcome to the Super Mario Wiki! I'm BabyLuigiOnFire (talk) We're glad to have you as a member. If you have any questions, just post it on the FAQ talk page or ask an experienced member and/or sysop. Blah blah blah. Got that from Timmy Tim's welcome.
Ok, so what do can you do? Go to the help section of the main page if you don't know how to do something or you can ask me! If even I don't know, contact a sysop or an administrator. Let me give you advice: If you don't know, say, how to create a table, then go to a place with a table in it and copy from there. Also, make sure to use that preview button in case you hadn't noticed.
Well, you can go ahead and have some fun, but I strongly discourage vandalism or any of that stupid stuff. People will find out if you do something like delete a whole page on purpose.