If you already have an account set up and would like to link ivee to it, give the command "ivee account". ivee will then direct you to my.helloivee.com where you will be asked to enter the 2-word combo provided by ivee. After that, your ivee should be linked to your account. Say the "ivee account" command again for ivee to display your account details.
Note: Linking an ivee to your account only pertains to the Sleek. If you have a Digit or Flex, there isn't any account setup process.