Steps for online correction on TRACES is as follows:
Login to TRACES website with user ID, password and TAN
Under defaults, choose ‘Request for correction’
Enter relevant Financial Year, Quarter, Form Type whether, Latest Accepted Token number. Correction category should be “Online” and click on ‘Submit’
A request number will be generated
Click on ‘Go To Track Correction Request’ under Defaults again and enter Request number or Request period and click on ‘View Request’ or you can also click on ‘View All Requests’
When request status** becomes ‘Available’ click on Available / In progress status to proceed with the correction
Provide information of valid KYC
Select the type of correction category from the drop down as ‘Challan Correction’
Make the required corrections in the selected file
Click on ‘Submit for Processing’ to submit your correction
15 digits token number will be generated and mailed to registered e-mail ID
Online correction for ANN-II correction will be too confused for who are new for this type corrections. I suggest you can do offline, i mean through RPU utility is a easy process.