Dear student,
You can definitely correct your roll number in case you had done some mistake while filling it. Students are allowed to correct the information regarding their academics when the correction window opens. The correction window will be opened from 19th January till 21st January, 2021. The registration process will end on 16th January while the last date to pay the fees is 7th January. For more info you can visit the following link:
https://engineering.careers360.com/articles/jee-main-application-form-correction

Hello,

Yes you can change your 12th roll number in the JEE main from during the correction window. NTA has released the JEE Main correction date 2021. The application form correction of JEE Main 2021 facility will start from January 19 to 21, 2021. The direct JEE Main form correction link will be available at jeemain.nta.nic.in. The facility of JEE Main photo correction will also be available. Candidates have to login using their registration number and password to do correction. Candidates providing incorrect/inappropriate information in their JEE Main application form 2021 will be rejected/will not be considered for admission.

Def initely there is option of edit your application form by clicking on the tabb you will change

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