The Online Account already has the Bizum service activated so you can instantly receive or send money with your cell phone, as if you were sending a message.
If you don't have Bizum, it will be activated with BBVA and you'll be able to receive and send money from the outset.
If you have it in another bank, you will only be able to send money from BBVA. If you also want to receive money via Bizum at BBVA, you can instantly change it from the app.