I don't know my username and password

I don't know my username and password. I can't  login my iMac at the salon. I sign up on my google acc 

on my phone I can check it but not my iMac 

The username of your account is vietyamato. If you sign up with Google the password was not created. You can create it by following steps from this guide:

How to reset JotForm account password