HI JCU,
You wrote: "I've haven't found a way yet to just write the formula without the formula window popping up."
Not surprising, as there isn't such a way. You can come close by entering your formula as text into a text box, copying it from there, then selecting the cell that is to receive the formula, pressing = (which opens the Formula editor), and pasting the copied text into the editor.
The great thing about the Formula Editor (other that being moveable) is that it immediately parses the formula as you enter it, and provides tokens (some call them lozenges) naming or describing what you need to enter at that location in the formula.
In a lot of cases, you'll be able to click, rather than type, to build a formula, and when you do type. Numbers will supply examples of where it thinks you're going, providing the option to move forward with another click.
Looks like you're already outgrowing that user name!
Regards,
Barry
PS: That green checkmark button labelled "Solved" is more useful to other users with a similar question coming across this discussion when it is placed on the post containing the solution.
Posts marked with Solved or with the Helped button move to the top of the discussion, immediately below the original post with the question. For a person with a similar question and happening to get to this conversation finds a solution on the first page he's opened.