It means you should write your name using capital letters. E.g.: William Shakespeare.
AMERICA
Block capitals are a capitals letter written by hand, especially ones which are particularly bold or thick.
Roman numerals written in block capitals.
MI6 (the British Military Intelligence) agency is always spelled with capitals.
Sometimes people write capital block letters more clearly than small letters. Also, many official forms are scanned by a machine and the letters need to be consistent, so the machines can scan the information accurately.
It is assumed that those that write in all capitals are shouting. If there is a monitor, you will get a warning. If no monitor exists then you will irritate people into saying rude things to you.
Deserts countries and their capitals
It means write your name legibly with letters separated, preferably using capital letters to maximize legibility.
Virginia
Two state capitals that have United States Presidents in their name are Jefferson City, MO and Lincoln, NE. Madison, WI and Jackson, MS are two more capitals named for Presidents.
because Capitals in an e-mail indicate you are yelling