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It's in the bottom-right corner of the screen. A pop-up menu will appear. This option is in the pop-up menu. Doing so opens the Settings menu. It's at the bottom of the Settings menu. You may have to scroll down to see this option. You'll find this option in the "Printing" section of the menu. Doing so opens a list of the currently available printers. Click the name of the printer you want to use. It's below the printer's name. Doing so adds the printer to your Chromebook's list of usable printers. Once you've done this, you can proceed with printing from your Chromebook. If asked, click the specific name and/or model number for your printer before continuing.
Click your account icon. Click Settings. Click Advanced. Click Printers. Click Add printer. Select your printer. Click Add.