Hey CharlieSwo :)
Welcome, and good to have you here. What Shi said already, and if it's a technical howto problem you are facing, then additionally to the https://www.wikiloops.com/music-collaboration.php and knowledge base tips there are also some older videos which explain the first steps here, like in here:
Feel free to search the WL YT channel in https://www.youtube.com/@Wikiloops for more, or ask questions here or in any other forum.
Hope that helps?