Go to https://accounts.google.com and log in using the email and password provided after purchase.
Once logged in, visit https://gemini.google.com or open the Gemini app (Android only).
You will now have access to Gemini Advanced features powered by Gemini 1.5 Pro via Google One AI Premium.
You may change the password and recovery info (phone or recovery email) for your own security.
Do not change the primary email address or any billing settings.
→ Doing so may lead to permanent deactivation of the subscription without refund.