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Unfortunately Ivy, it is not possible to change the form that is made after uploading your PDF file directly.
The only way to do it is to clone your form following these steps: How to clone an existing form from your account?
There is however something important to note and that is that if you do this, you will be changing a form that looks a lot different than your originally uploaded form, but would allow you to see the fields from it.
The style is usually much different since a different system is used for such forms.
What I recommend instead is to create the form from the start, but changing only a submit button position might allow you to make a quick edit and have the same layout that you were after.
Do note that each form accepts its own submissions, so if you give the PDF of the clone, that is where the data will be sent (to the submission panel of the cloned form).