Yeah it's kinda confusing :P Normally, は is pronounced as 'ha'. That is, when it is used as part of a word. When は is shown as a grammatical particle (marking the 'topic' of a sentence), you will pronounce it as 'wa'.
Example:
わたし は はなび が だいすき です
Is pronounced as:
"watashi WA HAnabi ga daisuki desu"
July 2, 2014 at 2:37am