To insert a formula or an equation, go to the Insert toolbar and click on the Equation Editor icon.
After you have entered the formula or equation, click on File and then Update to register it in the document.
Video 2.6: Insert a formula/equation
Note: The equation/formula can be edited or modified after saving as long as the PatXML document has not been closed. On closing the PatXML document, the equation is converted to a graphic image and can no longer be edited.