gtk:editable-insert-text (editable text pos)

editable -- a gtk:editable widget
text -- a string for the text to append
pos -- an integer for the position the text will be inserted at

The integer for the position after the newly inserted text.

Inserts text into the contents of the widget, at position pos. Note that pos is in characters, not in bytes. The function returns the position to point after the newly inserted text.