5v rgb led strip on uno

i bought this 5v rgb led strip on amazon and i want the ardion uno to power it how do i do this?

You can't drive that many LEDs directly from the Arduino. You'll need a transistor or MOSFET for each color. [u]Here[/u] is a MOSFET driver circuit. It shows 12V, but it will work with 5V or a wide range of voltages.

(You'll need to disconnect the supplied controller.)

why cant i jut hook the ledsto the 5v connectors on the uno wouldn't it be the same as plugging it in via usbon a computer?