Error when setting up shop

[gigi]

Any help would be appreciated. I have just got Siteground hosting to finally get VM2 installed after a couple of attempts.
Whilst I was setting up, I put in the ADDITONAL INFORMATION in the SHOP setup but it would not let me save the information and kept going back to the siteground login I made for them.
So then I deleted that login, so now I get an error. It will not then save the information. Can I get rid of this error, obviously to do with the deletion I THINK of the user??? Is there still an issue with this installation possibly.
PLEASE HELP!
I have attached SCREENSHOT

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