Dashlane has its own customer support central where you can find answers to most common questions: https://support.dashlane.com/hc/en-us. If you need help with your redeem code, please contact goodtrust.help@gowalnut.com
You can also contact Dashlane support by writing an email to support@dashlane.com. Dashlane also offers live chat support. Go to the bottom of the page: https://support.dashlane.com/hc/en-us and find the message button.