Large Meeting

Hello. I want to arrange an Large Meeting up to 500 people for one of my accounts. How do I specify which account to apply this to?

so I am assuming you are the admin on your Zoom account in which case you would login to your Zoom account webpage-->under advanced-->Users-->locate the user you want to assign the large meeting account to.  click the Edit button to the right of the user. if you have paid for the Large Meeting license you will have a check box.