You can sign in to your Bulb account using the email address you used when you joined Bulb.
If you don't know your password or it's tricky to type, choose ‘Email me a link to sign in instantly’. This will send an email with a button that'll sign you in. Emails can sometimes end up in your spam folder so be sure to check there if you don't see it after a couple minutes.
Remember to keep the email private. The signin link expires after 24 hours, but anyone with the email will be able to access your account during this time.
You can also reset your password if you can't remember it.