You access your affiliate account via your vidIQ account. To update your vidIQ password, follow these steps:
Go to app.vidiq.com and log into your account
Click your profile picture in the top right
Click Account Settings
Under Personal info, in the Password and Confirm password fields, enter your new password
Click Save
If you have problems updating your password, reach out to support@vidiq.com. If you have problems accessing your affiliate account specifically, reach out to affiliate@vidiq.com.