To do Alt + N X on Mac in Excel, download and install Accelerator Keys, then press Option, followed by N and X.
Command: Text Box
This is how to do Alt + N X on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + N X inserts a text box into your spreadsheet. Text boxes are floating containers for text that can be positioned anywhere on the sheet, useful for annotations, labels, or adding formatted text independent of cells.