Dear Anjali, CLAT application process has no correction window. So what you enter there stays there once you have submitted the application form. This applies to the minute to major errors. You will have to re-register with new Email id and Mobile no#, fill in the form correct and make a new payment altogether. There is no alternate to this. 

Hello Anjali,

CLAT authorities may open a one-time open correction window. This will be the only chance when you can edit wrong entries like candidate name, gender, address, date of birth, qualification etc. But when and if this will open, the date is not clear and there is no surety that it will open.

All the best!

Please do tell in case you have any further queries.