switch on reminders, upcoming birthdays

i'm sorry but I can't find where the reminders can switch on again. Thank you for your help!

Here it is

Regards

Thank you but it's not what I asked for. Probably "reminders"is not the correct term. I'd like to be reminded about my students' upcoming birthdays. What shall I do best?
Thank you and kind regards

The option I've shown you will do just that.

Once you have the reminders on screen tap on the magnifying glass and enable 'upcoming birthdays'

Thank you. I had to look for it for a long time. It would have helped if you had mentioned that first I have to chose the page "classes".
Will that "papercliped paper" with the reminders appear only on that class page? Until now I didn't use the to-do-list, but I'd like to. It would be helpful to have that memo on more pages.
Thank you for your patience with me
Kind regards from the very sunny Switzerland!

If you are concerned about those birthdays, here is another way to see them:

Open a class > Summary > Widget > Enable here 'Upcoming birthdays'

This widget is focused on a single class but that may help as well.

Regards