I know from reading the forum that Alt+Keypad 4/6 will nudge events one frame left or right but how do I do that on a laptop that does not have a keypad?
Notebooks will usually have a special key or function key that enables a keypad on your keyboard. You may even see numbers and letters on the same keys (e.g. there may be a 7 and U on one key and an 8 and I on the next, etc.).
If that fails, you can always purchase an external keypad that can be used with your laptop.