Final answer:
The Insert Function command is located on the Formulas tab in Microsoft Excel, represented by an fx symbol, allowing users to search and select from various function categories.
Step-by-step explanation:
The Insert Function command in Microsoft Excel is found on the Formulas tab. When you want to insert a function into a cell, you can go to this tab and click on the 'Insert Function' button, which is represented by an fx symbol. Excel provides a wide range of built-in functions that are grouped into categories such as Financial, Logical, Text, Date & Time, Lookup & Reference, and more. By clicking on the 'Insert Function' button, you will be able to search for and select from these functions. Additionally, Excel’s function library also allows you to directly select a function from a specific category without using the 'Insert Function' dialog box.