On the computer should be a task line with puttens on the top of the screem , move your mouse on it and look what kind of butten offers the butten “ groups “ than click on it ams you will get leaded to a side where randome groups are . There you can search for groups by searching words like “ fnaf “ “ undertale “ ect. If you found and interesting group , click on it and than search for a task line that has the botten “ join “ , write a nice message and send it , you should get accepet into the group doractly than ^^ if not ,just wait a few hours .