1) It sounds like you created your game but never actually submitted it to the jam... Anyway, if 70 people managed to join and you didn't, you definitely did something wrong along the way.
2) I must create a separate link for each entry, you can't expect to use that of another candidate. Here is yours, click on it using the same account you used to publish your game https://itch.io/jam/410565/add-game/4042363/4288252?token=xeRSyxGv5eudKNfMmxfT3b...