Requirements:

Android device(with active internet connection)
Latest Version Of Whats App Messenger (DOWNLOAD)


Method:

For Bold Text, Simply type your message with Asterisk in the starting and in the ending of the message
*EXAMPLE*


For Italic Text, Simply type your message with Underscore in the starting and in the ending of the message.
_EXAMPLE_

For Strikethrough Text, Simply type your message with the tilde in the starting and in the ending of the message.
~EXAMPLE~