Why can't i change my password

[AC Question]

I changed my password to incorrect password so my friends could get a good laugh. I have the Samsung galaxy core prime. When I want back to change my password, it said enter password as always. I then would enter my current password. I was going to change my password to my usual password which is just swipe until, it said oops wrong password. I entered it a couple more times thinking I misspelled it but I kept trying so many times it locked me out. I really want to change my password and don't know how. Please help.