Question

how can you insert a function using insert function

Answer 1

When you click the Insert Function button, Excel displays the Insert Function dialog box. You can then use its options to find and select the function that you want to use and to define the argument or arguments that the function requires in order to perform its calculation.

Answer 2

click the cell in which you want to insert the formula

to start the formula with the function click insert function on the formula bar

select the function you want to use

enter the argument