if the place where i work has health insurance how doi ask to use it?

I have a thyroid problem and i want to see a doctor that can prescribe something for me so i can lose weight and be healthier and the only health insurance i have is the one that my job provides for me. I dont know how to go by asking them to use it for this since i will just begin working for them.
--------------------
when you started working you should have been given a medical card for insurance purposes. If you have recently joined you should go to your HR department and ask them for a booklet describing the health insurance plan - if it is a benefit of the company then you shouldnt be afraid to ask for information. Good luck!
Source