Stock Grubee GT5 carb question

I'm relatively new to 2 stroke engines and as far as i know the carb should have a plunger bulb (tickle button) to prime the carb and suck fuel into it but as far as i can see there doesnt appear to be one. Where i would expect to see one there is just a male fitting for a hose with a 4" plastic tube attached. There are also 2 more of this fitting on the other side of the carb that also have plastic tubes attached. I just finished building it and tightening the chains today and havent fired it up yet.

I have the Grubee Skyhawk GT5 2012 edition all stock accept for the shift kit from Sickbikeparts.com.

How do I prime this thing? What do I do with the plastic tubes?

I decided to prime it the old fashioned way and turn it over a few times and that worked, but after a few minutes of dicking around with the carb i found that what i thought was the idle adjust screw was actually a bleed valve for the fuel line. unscrew it and it fills right up and the lower tube is the dump line.

That aside, i finally had my first powered run and it was amazing! With the shift kit on i was actually able to pass cars on the street, although i didnt have enough of a straight away to put it in 7th gear for a top speed test. Cold weather didnt seam to be much of a hinderance to the engine (45 F).

Also, what are the other tubes for? And the idle screw doesnt seam to be spring loaded and its inset. I had read a suggestion from someone to attach it to the bike with a piece of wire but i dont think i can. I'm afraid that at somepoint it will just fall out and ill be out of luck. Here's a picture.

Thank you for the information.