Admin menu - how to unlock a user account locked out due to failed logins

Where in the Admin menu can I find to unlock a user? One of our employee got locked out due to failed logins.

fyi we are on the CucumberStudio platform cucumber.io (not our own server).

Hi David,

Could you please send us an email at: studio@cucumber.io with the details of this user account?

Kind regards,
Houda