JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Are you referring to this form? (http://www.jotform.us/form/60437625159156)
To adjust the width of your field, simply follow the steps below:
1. Click on the single column field
2. Click the Size button on the menu
3. Input the new width of the field.
Here's the screenshot of the field where I applied the size 80 to the E-mail field of a cloned form.
You can check out the cloned form by following this link: https://form.jotform.com/60450741915958
If you want to clone it, then you can simply follow the instructions in this guide: How to Clone an Existing Form from a URL
Do let us know if you need further assistance.