When using the Function tool to write a formula, the following message will appear. Click OK to close the message.
Once the message has been closed, the Function Arguments window will be displayed.
This interface allows you to write formulas without having to worry about syntax. To start, select a function from the Function List, and then populate the required fields for the function. When all the fields have been entered, the Insert button will become active.
To use the Function tool to breakdown a formula, you must highlight the function before clicking the Function button.
See the knowledge base article Formulas to learn more.