Once the Registration Link sent to you expires after 24 hours, you will have to go back to the CES e-Portal Sign Up Page and request for another Registration Link.
I tried uploading my passport is not going through
How do I combine all my credentials into a single PDF?
My Account is temporarily locked
The ePortal says my passport photo is invalid?
The ePortal says my PIN is expired, what do I do?
I do not remember my Application No and Password