How to enter special symbols in Blogspot blogs on Windows.
When entering special characters in Windows, assuming there is not a special function on the blog for doing so, make sure your numlock key is on, hold down the ALT key, and type the 4 numbers on the keypad, then let go of the ALT key. Your character should appear.
Trademark = ALT-0153 = ™
Registered mark = ALT-0174 = ®