Go to https://eduid.chand login with your edu-ID password. There you can set your password. If you choose a new password, remember to update this password in all your clients that connect to SWITCHdrive.
In most cases, you may just have missed the last step in the onboarding process, which is the registration for this service. If you see the error message that the login has failed, just click the blue link in the error message to register SWITCHdrive. Then try again to login. If this still fails, get in contact with the SWITCHdrive support.
Click here for a detailed description how to register SWITCHdrive.