You can delete your Bluebook account immediately or after 90 days by signing into your online account and following the steps given below:
1. Sign into your Bluebook account
2. Choose 'Settings' on the right hand side of the page
3. Choose 'Delete Bluebook account' on the bottom left hand side of the page. This will then delete you account within 90 days. This will give you time to save or transfer any information, texts or photos stored on there.
4. If you would like to delete it immediately, simply choose the option 'Deleted' next to the 'Settings' option.
Please note that all data saved in your bluebook account will also get deleted.
If you chose the option to delete as in step 2 above, I am not sure if you can go into it again to choose the option to delete straight away. If you can still sign in you should be able to delete as in step 3.
Hope this helps