If you wish to create an email alert, here are the steps to follow:
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".
At the left bottom, you will see "Create a new alert", so click on it.
Select the Category of your search in the drop-down menu.
Select the area where you are located.
For more accuracy, enter different keywords that fit your requirements by separating them with a comma.
The fields you need to fill afterwards depend on the category you are interested in (Vehicles, Property, Services, Dating...)
Then choose how often you would like to receive an email from Vivastreet and finally, click on "Create an alert" to submit.
All you have to do is to wait until someone posts an ad similar to your alerts.
Good luck with your search!