A fairly easy read for those not that familiar.
Hopefully that link works.
Most people will need their t3 in upper part of the range as she mentions. If you have not had your free t3 tested, you can ask your doctor to put it in next labwork.
But warning to the newbie who never took t3, never go from all day t4 meds and a suppressed TSH to next day adding lots of T3. Best if you withdraw some t4 for a few days to a week and slowly add the t3 in right measures to give you the same TSH as your goals.