You can move pieces either by clicking-and-dragging or by clicking on
the "from" point and then on the "to" point. You can drag a single
man the combination of both dice (e.g. you roll a 3 and a 4, you can
move one man 7 points), as long as you can legally land on at least
one of the points that one or the other die would get you to. If
there is a single opponent on that intervening point, it will be
automatically hit. Not that if both possible intervening points
contain one opponent, the one on the point from the top die will be
automatically hit. If you want to hit the other one, you must make
two separate moves.
Clicking on "Undo" after making one (but not all) of your moves
takes back all moves made (you keep the same dice rolls). Clicking on
"Undo" when you have made no moves takes you back to the beginning of
the other player's previous move.
To bear off at the end of the game, drag the men to the open area
at the right side of the board.