I would like to tell you a story about when I created my account so that I don’t have to chill out when someone else runs into the same problem.
As soon as I heard the news of the InstaMAT release, I immediately tried to create an account to try it out.
However, I never received an email to create an account. I tried this and that to see if I had the wrong address, but still no email.
I was depressed that I must have done something wrong.
When I checked my e-mail again in the evening, I found that the e-mail had arrived and the procedure went smoothly.
I realized that when mail does not arrive, it is best to take a break and have a cup of tea.
I hope my failure will be helpful to someone.