i want to have a macro code change based on input from a textbox in a form

so I have this code and I want the "100" that's show in red to change based on input from a textbox in a form..

my form is called "qtyform" the textbox is "qtybox" and the form also has a "enter" button called "enterbutton"

thank you!!

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I am assuming this macro is called when the enterbutton is pressed.

If this is the case try changing it to

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