Use the WAD buttons to control the player. Same with the right and left arrow keys. Press "f" to eat (and possibly get golden health that let's you keep surviving thorugh any kind of damage) and "g" to put on a kind of armor (press E to see what you got) and E for inventory. Click to kill/mine/break items 1, 2, 3, 4, 5, 6, 7, 8, and 9 buttons control the GUI slots.