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Super Text Mesh is just a text renderer, not a text editor, so it doesn't have a caret it keeps track of by itself. To edit text at a certain position, you have to keep track of the "caret" with a variable.

Here's some pseudocode of how you can do this:

public int caretPosition = 0; 
public SuperTextMesh stm;
public void InsertTextAtCaret(string newText){ 
    //add the string to super text mesh's text variable at the caret's position
    stm.text = superTextMesh.text.Insert(newText, caretPosition);


} 

To reiterate, this type of code can run in any string, not just Super Text Mesh's "text" variable!