http://www.polydes.com/3.4.0-extensions/Take the following files
engine-extensions/com.polydes.datastruct.zip
engine-extensions/com.polydes.dialog.zip
extensions/com.polydes.common.jar
extensions/com.polydes.datastruct.jar
extensions/com.polydes.dialog.jar
Put them in your stencyl workspace. You can find it by opening Stencyl and going to Debug > View > View Workspace Folder.
The .zip folder should be extracted. Make sure you only get one folder, not multiple layers of folders, and it's named correctly. If you did it right, the following paths should be valid.
stencylworks/engine-extensions/com.polydes.datastruct/blocks.xml
stencylworks/engine-extensions/com.polydes.dialog/blocks.xml
Just move the .jar files.
stencylworks/extensions/com.polydes.common.jar
stencylworks/extensions/com.polydes.datastruct.jar
stencylworks/extensions/com.polydes.dialog.jar
Reload Stencyl and try it out.
You can use the sample game to start with. Grab that from the link above in the sample-games folder. Import it to Stencyl by dragging it into your games library.
You can watch TheIndieStation's tutorial series for more, and you can search/browse this forum as well.
http://community.stencyl.com/index.php/topic,40279.0.html