There may be other unforeseen breakage primarily in the handbook portion of the wiki.
The Table Of Contents section of each "PC-BSD® Users Handbook" page may be the best workaround.
Uninstalling a PBI
To uninstall a PBI, simply highlight it in the Installed Software tab and click the Remove button. In Figure 5.1.2a, the VirtualBox PBI is selected for removal:
Figure 5.1.2a: Highlighting an Application to Uninstall in the Installed Software Tab of Software Manager
Software Manager will prompt you to confirm that you wish to uninstall the application. Software Manager will then remove the application's subdirectory within /Programs, as well as its entry in the KDE menu. If you have created any desktop or panel icons, you should remove those manually.