dude all the directions that are given on the moves list are based on the joystick or arcade board you need to adopt it for your keyboard arrow keys at first its pretty tough to figure it out but after a while it becomes easy
charge is holding that key for about 2-3 seconds. ironically, it's actually easier to play charge characters on a keyboard than on an arcade stick (only at a fundamental level though) as you can press multiple buttons at the same time. on the stick you can only hold one direction at a time.