You can both access and edit these options by navigating to 'Extensions' > 'Ark Editor' and clicking on 'Ark Editor'. This will load up the screen as seen below:
Plugin Options
Administrator End Toolbar Mode
List of available toolbars
FrontEnd Toolbar Mode
List of available toolbars
Skin
Office Metro
Use Template CSS Classes for Editing Area?
Yes / No
Use Custom CSS Classes for Editing Area?
Custom file path option
Use Template CSS Classes for Styles ComboBox?
Yes / No
Use Custom CSS Classes for Styles ComboBox?
Custom file path option
Location of the Images?
Custom file path option
Location of the Documents?
Custom file path option
Enter Mode
P, BR or Div
Shift Enter Mode
P, BR or Div
Width
Width of editor
Height
Height of editor
Advanced Options
Display Errors
Yes / No
Language Selection Mode
Manual / Joomla! Default / Browser Default
Language Code
Set to 'en' by default
Background Color
Hex color
Font Color
Hex color
Font Size
Set in pixels
Font Family
Font family type
Text Alignment
Default / Left / Center / Right / Justify / Inherit
Process HTML Entities
Yes / No
Auto Format Source
Yes / No
Enable Magicline
Yes / No
Select the stylesheet you do not want the editor to use in WYSIWYG mode