Derby eclipse install

The install instructions for Derby 10.3.1.4 in Eclipse 3.3 implies that it is as simple as having the Eclipse\plugins directory containing these three directories:
org.apache.derby.core_10.3.1, org.apache.derby.ui_1.1.1, and org.apache.derby.plugin.doc_1.1.1, as obtained from extracting the zip files. And afterwards, the Apache Derby menu item should appear when the project folder is right-clicked.

In my case, that does not happen. There must be something small which is understood by experienced users, who write the instructions, that is not so obvious for beginners.

Can someone point me in the right direction? Thanks.