Summarize:

" Head to "File" in the upper-left corner of the Excel window. It should open a drop-down menu where you can choose many options regarding the handling of your Excel file. Once at the File menu, scroll down and click "Print." Print options will come up, such as Paper Size, Printer, etc. Scroll to the bottom of these options, and you should see a "Page Setup" link. Click it to open the Page Setup window. Click on the Sheet tab above the Page Setup window, and in the tab, you should see an empty check box that says "Grid Lines" beside it. Click the check box to enable grid lines. Do this by clicking "OK" when you're done enabling the grid lines.
Click "File. Select "Print" from the File menu options. Open the Page Setup window. Enable the grid lines. Save your changes.