To open that path, just paste it into the address bar at the top of File Explorer and hit ENTER. On Windows, your Slime Rancher save file is located at: %AppData%\.\LocalLow\Monomi Park\Slime Rancher Where your Slime Rancher saves are located varies based on the operating system you're using the play the game, so see help for your setup below. With your saves being stored locally on your computer (and not in the cloud), you can easily create backups, or share your saves with friends (which is great!). That means if you ever move computer, you'll need to manually transfer them if you want to keep your save data.
Slime Rancher saves are stored locally on your computer.