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I have no idea why no one has been able to answer your question. I set up a test birthday reminder yesterday. At the bottom of the reminder email which landed a short time ago, there is an unsubscribe option. Clicking on that button deletes that birthday without affecting any other reminders you might have set up. You can then go back into the yahrzeit anniversary birthday site and set up a new reminder. Hope this helps.
In Eretz Yisrael, Shemini Atseret and Simchat Torah are celebrated on the same day. This year they begin on Sunday evening and Monday, the night of 30 September and the day of 1 October.
By contrast, outside Eretz Yisrael, Shemini Atseret and Simchat Torah are celebrated on separate days. This year Shemini Atseret is on Monday 1 October and Simchat Torah is on Tuesday 2 October.
Please don't be offended but I am mystified why you would need an option to calculate something so simple?
We are given the mitzvah of brit milah in Bereishit parasha Lech Lecha (Genesis 17:11-12) in which we commanded to perform brit milah on the eighth day.
As a general rule, in Eretz Yisrael, the brit milah is performed on the eighth day irrespective. Here in the UK, and I suspect many other countries outside Israel, the mohel will aim for the eighth day but it is very much subject to the health of the baby. For example, the brit milah will be postponed if the baby is very jaundiced or if there are other health issues.
With regard to calculating the eighth day, you count the day of the baby's birth as the first day. So if the baby was born on Sunday, the eighth day would be the following Sunday.
I hope this helps.
Vezot haberacha is peculiar in the sense that it is a parasha specific to Simchat Torah only. There is no such thing as Shabbat vezot haberach.
Customer support service by UserEcho
Now I understand how it works, I'm going to answer my own question.
When you get the reminder email there is an unsubscribe button at the bottom of the page. By clicking that button you are effectively deleting that reminder - without affecting any other reminders you might have set up. (I cannot see a way to simply edit or amend a reminder.) So having deleted the reminder you can now go back into the yahrzeit anniversary birthday site and set up a new reminder.