Deleting your email alerts once you have found what you need is very simple:
Go to the Vivastreet homepage.
Then on the right top corner, click on "My Account".
Once you are in, click on the tab "My email alerts". You will see all of them straight away.
If you wish to delete only one alert, click on the blue link "Delete" under the one you wish to remove. It will be deleted straight away.
If you want to remove more at the same time, please select them by ticking on the box at the left, and clicking on "Delete selected alerts".