replace superdrive in 17" iMac

How do I replace the superdrive in a 17" iMac with a 1.83 GHz Intel Core Duo processor?

Model Name: iMac

Model Identifier: iMac4,1

Processor Name: Intel Core Duo

Processor Speed: 1.83 GHz

MATSHITA DVD-R UJ-846:

Firmware Revision: FB2U

Interconnect: ATAPI

Burn Support: Yes (Apple Shipping Drive)

Cache: 0 KB

Reads DVD: Yes

CD-Write: -R, -RW

DVD-Write: -R, -RW

Write Strategies: CD-TAO, CD-SAO, DVD-DAO

Media: To show the available burn speeds, insert a disc and choose View > Refresh