Apple OS X DesktopAn Account Name is the user name you use w

Solution

When trying to create a new account, we firstly need to select the type of account we want to create: administrative account, standard account, managed with parental controls, sharing only or a group. After selecting the type we need to enter the full name of the account. Once entered even if wont enter the account name, which is next to the full name text box, the apple os x will generate it from the already entered full name. It is selected such that its length is as short as possible.