Thrush how to make it go away?

See your doctor. You don't say where you have it so depending on the region see your dentist or physician so they can prescribe the appropriate medication.
Thrush=fungus. Thrush is relatively common in infants/children, but not so in health adults unless something happened. Such as recent use of antibiotics, infections, steroid uses (such as those for asthma/copd/allergies), or immunosupressed states such as hiv, cancers etc...So, check with your doc. If it is thrush, it can be easily treated, but this requires a prescription from your doc... Good luck.
Thrush in an adult? You should be seen by a doctor and tested for immune deficiency states, including hiv. Normal adults who are not diabetic or taking antibiotics should be having thrush without some underlying reason. Go get evaluated.