Do you want to do the print head alignment from a computer or from the printer? If you are using a computer, what OS is installed and did you install the Canon full software package?
In any case, first load the printer with A4 or letter size white paper (at least two sheets) and make sure to set the paper size to that format. Make sure that none of the ink cartridges are reporting low ink. If a cartridge is low, replace that ink cartridge before continuing. (The printer must be on.)
If you are doing the print head alignment from the printer, press the Setup button (with the screw driver and pliers) several times until 4 is displayed on the LCD. Press the Black & White or Color copy button. Once the alignment sheet has been printed, carefully pick up the sheet without touching the areas with ink. Place the sheet print side down on the scanner glass. Make sure that the alignment mark on the bottom right corner is aligned with the alignment mark on the corner of the scanner frame (left side of the printer near the hinge of the document cover). Close the document cover and press the Black & White or Color copy button. Wait for the flashing lights to stop before moving the document cover or alignment sheet. If you see the Alarm light flash, press OK and take the appropriate action based on the error message.
From a Windows OS computer, open the Canon LJ Printer Assistant Tool. Click the Custom Settings link. Check the box for Align Heads Manually and check any other appropriate settings. Click OK and then OK for Apply these settings to the printer. Press Start on the Print Head Alignment. Do not open the printer cover. Once the alignment sheets are printed, look them over and answer the questions on whether the alignment looks correct for all of the rows and columns. See https://support.usa.canon.com/kb/index?page=content&id=ART167892&actp=search&viewlocale=en_US&searchid=1577398967983
for the pictures of the correct alignment sheet.
From a Macintosh, you need to use the Remote UI. Then select Utilities and then Auto Head Alignment. Follow the on-screen directions.
I hope this helps.