Change subscription email address

Hi, My husband subscribes to hundreds of blogs. Now he needs to change the email address he subscribes with.

Neither of us have any idea how to do this in WordPress. He has a wordprress account, but he doesn’t have his own blog. He uses the wordpress account to follow and subscribe to other blogs.

Now he wants to change that email address, so when someone posts a new blog, he’ll get the alert at his new email address. Can anyone help? Thanks!