Check with your DB2 administrators if they can provide these jar files, take a look at this page about where to get the DB2 jars.
If you have already downloaded external modules, you can install them manually into your Talend Studio.
Procedure
Click the button in the upper right corner of the Modules view or in the Jar installation wizard to browse your local file system.
In the Open dialog box of your file system, browse to the module you want to install, double-click the .jar file, or select it and then click Open to install it into your Talend Studio.