1. The keypad on a laptop is located on keys
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2. You must engage the keypad. Find and hold the "fn" key and press the "num lock" key.
On my laptop it is located on the "scroll lock" key. A little led bulb should light to show that the keypad function is engaged.
3. Now you can type in the alt symbols just like you do on a desktop PC. On my laptop the fn key is between the ctrl and the alt keys on the left side of the keyboard.
My laptop is an HP Pavillion. The placement of the "fn" and "num lock" keys may differ on other laptops.