To edit a footer in your PowerPoint slides and include citations or notes, you'll need to access the Header & Footer menu from the Insert tab.

QUICK ANSWER To add a header or footer to your Google Doc, double-click the margin at the top or bottom of your page. Alternatively, you can click Insert > Headers & footers > Header or Footer.

Insert a Footer in Excel If you want to add a footer to an Excel spreadsheet, click the "Insert" tab on the ribbon menu. Then click "Header & Footer" within the "Text" group of options.