A little help with the mahjong mini game?

I could go on about how I don’t understand it but I’ll just get straight to the point. I’m so desperate that I tried to use one of those mahjong calculators, but every time I want it to tell me what to do with my hand it says something like “unable to form winning hand melds” like what the hell does that even mean? I wouldn’t be making a post if I had any idea what to do but I just don’t.