Edit an equation in Equation Editor. If you used Equation Editor to insert an equation, you can also edit that equation in Equation Editor.
Double-click the equation object that you want to edit. Use the symbols, templates, or frameworks on the Equation toolbar to edit the equation.

In Word, Excel, or Outlook, to return to your document, click anywhere in the document.

In PowerPoint, to return to the presentation, in Equation Editor, on the File menu, click Exit and Return to Presentation.

Insert an equation with Equation Editor. On the Insert tab, in the Text group, click Object.

Insert object. In the Object dialog box, click the Create New tab.

Use the symbols, templates, or frameworks on the Equation toolbar to edit the equation.
In Word, Excel, or Outlook, to return to your document, click anywhere in the document.

In PowerPoint, to return to the presentation, in Equation Editor, on the File menu, click Exit and Return to Presentation.