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I presume you are referring to the total payment field in the form titled "Fall Conference 2016 Registration"?
If you want to change the width of the text box for the total payment field in Paypal, you can insert this CSS code in your form:
width: 200px !important;
Just change the width value with your own preference. Paste it under the "CSS" tab in your "Preferences" settings:
Let us know if that works.