By default, the Insert button appears on the right side of the writing area after you start to write. To change where the button appears, tap the Settings tab in the Options dialog box, and then select Left side of the writing area.
By default, you must tap the Insert button to insert text. You can choose to point at the Insert button instead of tapping. To make this change, in the Options dialog box, tap the Settings tab, and then select Pointing to the Insert button inserts text.
Note: This information provided by Microsoft.