Open the chat dialog box, and click the 6th button from the left on the toolbar below the chat information, labeled "Select Chat Scene." After opening, choose "Unclassified Scenes," then select the name of the scene you installed and click to start playback (in the new version of QQ, after opening, select "My Scenes," which displays scene thumbnails. Any scenes you've used will have thumbnail images; those you haven't used yet will not).