I created an account, but I can't log into the wiki. When I type in my username and password it says that it is wrong. What should I do?
Wiki accounts are entirely separate from forum accounts. Currently, anyone who wants direct edit access to the Wiki needs to ask me for an account.
As you have made precisely 0 posts about FET around here and I have no idea who you are, I wouldn't approve any such request. Doubly so since you registered with a school e-mail address - it's pretty obvious what you want to do. If, against all odds, you show yourself to be a contributing member, we can talk later.
You can also suggest edits to the Wiki without an account, as per the bottom of the welcome page.