I am attaching a video link you can see how to lift open the front cover and the ink carriage head will be aligned at the center of the carriage rail then you can remove the ink cartridges one by one to replace it.
Yours was the Gateway LT20, correct? and I apologize for the other tech - likely just posted the information in the wrong ticket - it does happen time to time when we have multiple tickets open.
Reboot your computer and press .Alt + F10 as soon as the Gateway or Acer logo appears. You may need to press the keys a couple times in order for them to register. This will load the Recovery Manager.
Select "Restore Operating System to Factory Defaults". You will be asked several times to confirm that you want to proceed. Starting the restore will erase all of the data on the disk and then reinstall Windows and the programs that came with your laptop. The restore process can take up to an hour to complete.
Create your account and start using your computer. Once the restore process is complete, the laptop will act as if it has been turned on for the first time after you purchased it. You will be prompted to create a Windows account and configure your personal settings.