Click on the 'User' icon on the top right and then on 'Account Management (in the old control panel SUB ACCOUNT in the top right) then on "CREATE NEW SUB ACCOUNT". Enter username password and Email.
You can also [[Integromat.com#Create_a_Subaccount_from_a_Google_Form|create a subaccount via IntegromatMAKE]].
*Go to Account Settings