How can we insert a function in ms excel?

there are way to do that.

1. you can go to the cell directly and start with = sign that will indicate to Excel that you need to insert a foumula.

2. you can use insert folmula dialog box

3. you can write it in the formula bar. Start with = sign

that you for your question

You can insert the by pressing = sign and then writing the name of your desired function