The idea of this post is to help people stop minor vandals and trolls from returning to violate their pages again and again. It's kind of difficult for a first-timer but I've figured it out. If you are an admin or founder, look at the bottom of your page where it says "Admin" then open that in another tab. Go to User Rights then click the "Advanced" tab then scroll down to "Users and Rights" then "block user". Copy-paste the username or IP found under edit history. You can view edit history by clicking the arrow on the edit button on the wiki's page. If the vandalism is serious then ban them for 6 months to a year and make sure you check the option that allows them to stop making accounts from that IP address.