An editor is a rich text.
Editors are formatted with common formating options such as bold and italics.
They have some initial styles and you can change them what you want.
Editors have some properties as you see in the image below.
Value is value of the editor. You can enter it a value, if you want.
Label is the text that above of the editor.
Hint is the text that below of the editor.
Inital value of read only is unchecked and if you don't want it to be unchangeable, make it checked.