Once the migration is complete from backend, you will receive an email from Kotak Neo with steps on how to get started. Watch this video for more details:

How to Set Up Your Kotak Neo Account
Kotak Securities
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I am an NRI customer and I am migrated to Kotak Neo, How do I set up my account?
Will the migration affect the frequency or execution time of my existing SIPs?
Does the user ID and password remain the same after I switch to Kotak Neo?
Will I be able to use the Kotak Stock Trading platform after I move to Kotak Neo?