Intellij IDEA deploy on Tomcat

I'm trying to build a project on Tomcat.

pom.xml

<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.bitloor</groupId> <artifactId>bitloor</artifactId> <version>1.0-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> </dependencies> </project> 

Servlet

 public class MainServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{ PrintWriter out = resp.getWriter(); out.println("<h1>Hello Servlet</h2>"); } } 

web.xml

 <?xml version="1.0" encoding="UTF-8" ?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/javaee/web-app_3_0.xsd" version="3.0" > <servlet> <servlet-name>mainServlet</servlet-name> <servlet-class>com.bitloor.servlet.MainServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>mainServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app> 

But there was no such launch button.

Now it looks like this

What else needs to be done or what is wrong?