I just retested the feature and there might have been an issue in 8 that prevented it from working. I actually tested in trunk and, while I could see the controls, they were broken. Some investigation pointed to an other fix I had made in 8 recently but that had not been merged to trunk. If you have been using Tik8 RC1, that might have been the issue. You should upgrade to a later version. Nightly builds will contain the fix.
However, if you do not see controls at all, it may be because the configuration is partial.
- Create a category and note the category ID
- Go under Admin > Wiki > Flagged Revisions
- Above the page, make sure you show advanced settings
- You should enable flagged revisions, an additional field will display
- Enter the category ID
From the moment you will categorize pages in that category, the approval controls will display.
If this helped, please update the documentation in a way that would have made it easier for you.