Congrats on your first post! It was already mentioned you have to wait 24 hours, but something else to note is that it’s 24 hours after you got that pattern so it doesn’t reset at a specific time, it depends on the time you got the free pattern if that makes sense 
Something I try to do for newcomers if you ever need help never hesitate to ask in the community, if you need immediate answers feel free to use the help center, search in the community, or the wiki [link below] and community guidelines if needed Happy crafting! Hope to see your crafts soon as well