Checkbox radial button - very new here

Thanks for taking the time to read this post and offer help.
I'm so new I just found out about view code and the term vba today.

Here's my problem. I have an Excel sheet and I'm trying to make columns d4 to d-29 and e-4 to e29 have a checkbox. The user will either check the D or E column.

I read and found 'view code' answers and tried them and so far, nothing. I need a basics course and I need to know how to add the checkbox.
Here is the view code page info. Please forgive me if I have the wrong tags...I'm not sure what that means. Does it mean quote marks?
thank you,
Tracy

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