In the preferences-pane for the texteditor font-size and font-face can be adjusted. For this, the common OSX-Font-Selection is being used. Further font-color and background-color of the textarea can be adjusted. The selection of the color is done using the common OSX-Color-Selector.
The wordcount-behavior can be adjusted by checking the Checkbox, which determines if single letters are counted as words.
The option to determine which shortcut should be used for the selection of markers is for your own convenience. If you don't know which to use, try both and choose the one which is easier to handle.