Hi Charlie,
Could you please go to Help > Installation Details > then in the Search Field under the Tab "Installed Software" start typing "text" - if you have successfully installed the text processing extensions, you should see smth like in the screenshot attached. In case the fields are empty - go to File > Install New Extensions > type "text" in the search tab and select all text processing extensions from KNIME Labs and Sources. Here is a guide from our E-learning course on installation of additional extensions.
To access Examples Server right click on EXAMPLES in the KNIME Explorer in the top left corner. In the context menu select "Log in". Here you can find more information on our E-learning course for KNIME Examples Server .
For guide on text processing and example workflows, check out our Node guide under Other Analytics Types > Text Processing.
Hope it helps!
Best, Daria