Go to the menu above in BlitzIn. Click on Actions and choose 'Show my recent games' from the list..
This will display a list of your last 20 completed games, also known as your history.
Once you have your history list opened, right-click on the game in question, a list comes up, then left-click on 'Examine'.
Command Line Method:
Type 'history'' in the command console to bring up your last 20 completed games.
Find the game you wish to examine, noting the game number in the left most column,
Then type: examine ##
Where ## is the game number that corresponds to the game you wish to examine.
On the right of your board, below your move list, you will find your examine buttons.
The brown and green buttons are for moving back and forward in the game.
The white arrow in a purple field is to revert back to the main line after making alternative moves.
The small grey pieces in a pink field will give you a list of options for examining or editing a game.
These options are: Clear Board, Reset Board, Reverse, Copy from Game, Update Copy, Annotate, White to Move, Black to Move, Set White Clock, Set Black Clock, Set Game Info, Add examiner and Unexamine.
You can also use commands to examine or edit a game. For these commands read "help examine"