Ksp reference Manual

12.31. set_text()
set_text(,)
When applied to a label: delete the text currently visible in the specified label and add new text.
When applied to knobs, buttons, switches and value edits: set the display name of the UI element.
Examples
on init
declare ui_label $label_1 (1,1)
set_text ($label_1,"Small Label")
User Interface Commands
104
KSP Reference Manual

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declare ui_label $label_2 (3,6)
set_text ($label_2,"Big Label")
add_text_line ($label_2,"…with a second text line")
end on
Two labels with different sizes
on init
declare ui_label $label_1 (1,1)
set_text ($label_1,"Small Label")
hide_part ($label_1,$HIDE_PART_BG)
end on
Hide the background of a label. This is also possible with other UI elements.
See Also
add_text_line()
$CONTROL_PAR_TEXT
set_control_par_str()