The username and password is tied to the experiments you have created. For example, if I log in with the username/password: dai/dai and start an experiment, then I would need to log back in with the same username and password to see those experiments.

Currently, there is no way to change a username tied to experiments run by another username. If you want to use a new username and password, you can log in again with a new username and password, but keep in mind that you won’t see experiments from other usernames.