How can I change my particulars after submission of application and fee payment yet to be submitted?

Steps to modify Particular: 
1. Visit https://sarathi.parivahan.gov.in/ 
2. Select concerned state 
3. Select the "Application Edit (Learners' License Only)" from "Learner's License" menu 
4. Fill up Application Details 
5. Visit RTO on scheduled date, with original documents