making vendors administrators after unmarking the administrator account box

I accidentally unmarked the box that says create administrator account when adding a new vendor and when I go back in to edit that vendor it doesnt have that box to check anymore. How do I make the vendor an administrator for their account without starting over?

Hello, custompw!

To do it, sign in as the main admniistrator in the admin panel, go to Users->Add user, fill in profile details and choose the necessary vendor in the “Vendor” select box.