To tap a creature during attack phase, SHIFT click it!
To display information about any creature right-click it!
To expand the graveyard or the library SHIFT right-click it!
To cancle <some> abilities (like selecting a tapped creature, when none is available) click the "phase done" button, even if its called differently.
If the game slowes down after a while, try clearing the log/debug you find a button under configuration.
You can hide the opponents hands, go to configuration, this will give you more space for your own cards!
Enough of clicking "pass...", try switching on some automation - under configuration.
If you are asked to point to a player, click on its status panel (that is the once, that has the mana display on it).
If you want to use instant cards, that are only useable during "attackers phase" of the opponent, be sure to uncheck the "Auto pass on empty opponent stack" - checkbox for"Declare attackers step", otherwise you won't be asked to do so!
You can manually switch between "Phase information' and "Card information' panel by pressing the little "H'-button on the player status panel.