How to setup Home and Business to use same account for Personal and Business finances

I want to use my personal checking account as the account for my business as well. When I start the setup for the Business tab and I choose the checking account, it asks me if i want to convert the account. I don't know what that means and I don't want to mess up the current configuration for checking account. Do i just allow it to convert the account? If not, how do i configure the business piece to use my personal checking account? Thanks.