Loops in VBA

This code below does the following:

The user enters strings in a input box. A message box is then returned giving the user information about the string entered. When the user clicks the ok button on this message box, the whole process repeats itself until the user clicks cancel on the input box. I have two problems.

My first problem involves the if statement. If the condition of the if statement is true a message box appears telling the user that the string entered was too short (less than 10 characters). After the user clicks the Ok button in the message box, i want the input box in the beginning of the code to appear again giving the user a chance to enter the correct number of characters.

My second problem is that I am trying to figure out how I can return a message to the user when they are done entering strings (this would be when the user clicks cancel on the input box)

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What does this part of the code do?

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It checks if anything was entered in the inputbox.