In your App: To delete an Extra Chart you must go to the Astrolink's options menu and select the second icon in the lower area of the App.
On the new page, go to the fourth option, "Extra Charts". All additional Charts created will be available on your screen. When you find the Chart you want to delete, simply click on the trash can icon, located in the upper right corner, and you're done! You will have eliminated the selected extra Extra Charts.
On the website, you can opt out in this section.
If you have difficulties or have questions about it, simply send an email to contact@astrolink.com and our Support Team will help you.