You should use the correction window to change your UGC NET exam Centre. Here are the steps to do so
Visit the official website, then log in with personal details.   Click on the button/link with something like “application structure amendment” written on it.
Make changes in the necessary fields (exam center) of the application structure   Click on “Submit” to finalize your corrected application form.
However, you should be very careful and attentive while filling your UGC NET application form, and also make sure to fill it according to the instructions given. I am saying this to you to save you the trouble of having to change details in the application form during the UGC NET correction window.