Download Netbeans to your local computer. Be sure to download a version of Netbeans that includes Tomcat. The labs are still using NetBeans 8.2, so that is the one I recommend that you download to your computer. NetBeans is transitioning from Oracle to Apache. For now, we will stay with the last, stable, Oracle release.
If you have already installed Netbeans and did not install the Web version or the full version, then download either of those versions and reinstall. Netbeans will upgrade your current installation.