Iam trying to setup a new configuration and I select existing user

when I click next the error message I get is the following

"Existing user name is invalid and does not represent a current user in the membership store"

any idea how to bypass or which is the right user.

TIA

Wow, You guys are doing a great job, I thought customer service support was really the most important strategic for a business to succeed even though is "FREE Support" on my previous posted topic "New Installation" I only got one reply from the master developer which actually did not help me much other than trying to sell me his services, I understand that business only grows by collecting its fees when services is provided but I also understand that in order to make business there is not always a fee as long the business does not provide full service support.

Any way thank you much for your effort trying to help me on my very first installation of your software. I wish you good luck to your business grow.

TIA

:(