I’m trying to add a child to my family email but after submitting the information the screen freezes and nothing happens

I found the right place to add a child email, and filled out all required information.  I was properly signed in when completing the form.  But when I hit submit, the screen changed color slightly and nothing else happened.  I tried the email to see if it was set up, but it is not.  I tried again the next day on a different computer, same result.  I cannot understand what I need to do to get the account set up.  It is a hotmail account that I am attempting to set up.