When you enter a function in Excel, there are a few ways to get help with what you're doing. First, you can always go back and look at the function's documentation. This can be found by going to Insert > Function. Then, once you've selected the function you want to use, click Help on this function in the bottom-left corner of the window. This will open up the Help window with information on the function, including a description, syntax, arguments, and examples.
If you're still having trouble understanding how to use the function, there are a few other things you can do. One is to ask someone else for help—a friend or colleague who is more familiar with Excel, or even an expert on the Microsoft Office website. Another option is to search for tutorials or videos online. There are many helpful resources out there that can show you step-by-step how to use different functions in Excel.
Once you get more comfortable using functions in Excel, you'll be able to figure out most things on your own just by playing around with them. But don't be afraid to ask for help when you need it—everyone has to start somewhere!