Formula - Visual Vs Text

I haven't been able to succeed in creating a display-only scenario. Perhaps in part because the examples provided are (I think) what you would enter textually as opposed to using the visual function. For some reason, I can only use one or the other and can't switch back and forth. Either way, I don't know how to get on the screen what is being suggested above. Can someone help me understand how to create a formula as described above 'visually' (and perhaps how to switch back and forth so I can see what it looks like textually?) I've looked for tutorials but every tutorial I can find is just a portion of a course and comes in one-hour increments with (so far hours watched) no guarantee what I'm looking for will be discovered. Any idea why there are so few tutorials (none that I can find) outside of the course material?