Menstrual cup mishaps

Gina

So I recently tried the Softcup disposable menstual cup. Annnnd I think I did it wrong. It didn't leak while I was using it but it was slightly uncomfortable and when i went to the bathroom to pee, it like.... poured itself out.... is it supposed to be able to sit horizontal to the ground or something because it kinda just wants to stay in there at an angle. I don't know, but I think i need a real human to explain this to me.