Hi blakys,
besides enabling these tabs you will need to have at least one of the relevant services created and enabled.
POI is Special routes so at least one Published Special route is needed.
HIRE is Hourly hire which means that at least one Car has to be set with Hourly hire: Yes.
BUS is Shuttle routes which means that you need to have at least one Shuttle route created and Published.
When the above is done those tabs will automatically show at the front end booking form.
Here is a link to the online documentation that may help you figure out some questions you may have:
http://kanev.com/docs/taxi-booking
Hope this helps.
Best regards.