How to delete the original master user?

How to delete the original master user?

Hi,
Now that we are up and running using Zoho CRM, I want to delete the original user login that I used to initially set it up.
That account is not an active user and I want to delete the reference to them before I sign up to pay monthly rental on the active users.
Can I delete the master user and re-assign that designation to my own admin account login?
thanks
Pete