Step 1: insert the two lines of code below to lines 26 and 27:
line 26 and 27 added to M8-1_GUI, please see: M8-5_Student.
In the two lines, a Label object (lbl_MSG) is created and is added to the 6th row (row=5) and the 2nd column (column=1) of the Frame (frm_main), and it spans 3 columns (from column 2 to column 4). The text option of the Label is an empty string, meaning that the Label now has no content: the Label is there in the interface, but you cannot see it: