From the home screen, click on the Notifications icon in the left hand navigation. 

This will take you to your notifications. In the top right corner of the screen, you’ll see an option to ‘Manage Alerts’. You can then choose the relevant project to make any changes to the rules for that alert. 

1. Use the trash can icon next to the relevant rule to delete that rule. 
2. Use the larger trash can icon to delete the entire alert. 
3. Use the ‘Copy to’ option to copy all rules to another project, or to multiple projects. Click the 'copy alert to..' button (3 above) and then use the checkboxes to select which projects you want to copy the alerts to. If there are already rules in the project you’re copying to, the new rules will be added to the project alert. If a rule already exists for a specific metric, the new rule will be prioritized over the existing one, and overwrite it. Once you hit continue, you'll see confirmation that the rules are being copied across and, eventually, a confirmation screen once complete. If any rules could not be copied across (for example if you run out of alert rules), you'll get a notification to tell you which projects the rules have not been copied to.