On the EVO, first you're presented with a "forgot pattern" button at the bottom which will take you to a gmail sign in screen, assuming you haven't tried more than 20 times. If you know your gmail username and password, it will take you to the new pattern settings screen to setup a new pattern. If you DO NOT know your gmail info, you'll have to hard reset the phn, meaning all of your data will be lost that's NOT on your SD card.
To reset the device using the device keys:
1.With the device turned off, press and hold the volume down button (located at the right panel of the device), and then press the power button.2.When the device’s display turns on, release the volume down button.3.Use the volume buttons to selectCLEAR STORAGE
, and then press the power button. (All data will be deleted from the device.)