Instructions
Turn on your camera and put it into the "Manual" mode.
Select the "Flash Control" option. You will be presented with several choices.
Select the "i-TTL Balance Fill-Flash for Digital SLR" setting to use fill-flash for a better balance between the background and the subject. Select the "Standard i-TTL Fill-Flash for Digital SLR" setting if you do not care so much about the background and want to focus only on the subject, or when you are using exposure compensation.