Here are some steps to help you resubmit the DS- 160 application form with electronic signature:
1. Visit the US visa application website and log in to your account.
2. Click "My DS- 160", and then click "Update the existing DS- 160".
3. Browse your application form and find the information that needs to be updated.
4. Next to the information field to be updated, click the Edit button.
5. In the pop-up window, select the option "Use your visa applicant's electronic signature".
6. Enter your electronic signature, and then click the "Apply Electronic Signature" button.
7. Confirm all changes and save the new DS- 160 application form.
Please note that if you don't have an electronic signature, you can manually enter your signature in the additional information field. But this method may not be as secure as electronic signature, so if you don't have an electronic signature, I suggest you get one as soon as possible.
In short, if you don't have an electronic signature in the DS- 160 application form, you'd better resubmit the application and use a valid electronic signature. This will ensure that your application form is valid and safe.