For each Velixo function there is an article in the Velixo Functions section of this Help Center.

If you are typing a function by hand, you can click on the name of the function...

or, if you are using Excel's Insert Function feature, you can click on the Help on this function link:

This will take you to the online help article for that function:

Which explains how the function works, what parameters it takes, and give examples on how to use it.

Each article may include links to other article to help you refine how the function can be used.