How do I add GST details if I originally joined as a freelancer?

Ask support to review the change before entering GST details that belong to a different legal identity. Keep the GST registration and your current PAN and business details ready, and explain whether you still operate personally as a sole proprietor or have formed a separate company or LLP.

The right next step depends on the legal structure, not just the presence of a GST number. Do not assume adding GST converts the account automatically or changes records already issued. Use the same truthful legal identity across the account and supporting documents, and wait for confirmation of the account update or separate onboarding required.