Shouldn’t Set Text allow me to enter a string constant for the value? Why do I not receive a text box to enter the value?
Whether the node should, or should not all you to enter a string as a constant value, that the node would convert to a text value before using it. Is really a matter of preference. The programmer that set up this node, chose not to do it in that fashion.
If you wish to have a constant, then just create a Text variable, and wire it in, and set the variable’s value to the text you wish to have displayed.
Hope this helps,