Hello Shanmugapriya, it is possible to edit your TNEA application form. Till the last date for submitting the application form, you can make changes in the form. The last date to submit the application is Aug 16 - Sunday. So, better be quick in editing it and check it multiple times to verify whether you have entered all details accurately. After the final submission of application of form, you cannot edit your form. This year the DOTE has released the important dates table -

Events                                                          DATE (tentative)

Hope it was helpful. Stay safe!