Help needed with SQL queries

Question

Hello,
I am working on an application which is connected to a sql server 2008 database. I used the visual studio tool to connect to the database which allows me to show data in a datagrid. But now I want to execute other queries (add/ modify....) but I don't know how to do it. I mean I've already used sql so writing queries is not a problem but how to do it with visual studio....I've already googled on this topic and tried different solutions but it just isn't working. Can someone please give me an example of these queries? I'm using visual studio 2010.
I'd really appreciate some help here.
Thanks in advance.
Anila