Try the instructions below, but if they don't work, feel free to ask for help on the Discord server.
Exactly how you do that, though, depends on your browser. If that's the case, then you need to clear your browser's cache and reload, and everything should work again. Most likely, your browser is trying to access an old version of the javascript that runs this site, but it doesn't exist anymore. Oh no! If this text is up long enough for you to read it, it means that something went wrong. Loading Grandivory's Mods Optimizer for Star Wars: Galaxy of Heroes™