Select Different Style of Numbering From TextBox Using Macro Excel

I have a question here. Currently, I am working with a labeling project. Is there any way for me to select different style of labeling from the modules? I mean for now my code can only do 4 by 4 labeling, which is 1A, 1B, 1C, 1D, 2A, 2B, 2C, 2D and so on only. I want my code to do labeling from 1 by 1 labeling until 20 by 20 labeling. Can you please help me? Thank you in advance. The user can just typed "2 By 2", "3 By 3" and so on in the textbox from a userform to generate the output. In my code, I tried using case statement but it didn't works. These are the code that I edited and now it can't run:

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