The method is as follows:
For example, you want to use the REPT function in a cell, as in the following figure.
In the Formula entry box, first enter =rept ()
Then, the following will automatically appear in the background color is yellow color area, this time, use the left mouse button click function name, such as the Red line on the REPT function name, so that you can immediately open the use of rept function Help. The following figure.
Help for all functions, you can use this method to turn on Help.