Your tbars are on the top control arms.
Follow them back to where they join the chassis (under the front door area) and you will see a bolt head on the underside.
Some have a lock nut on top of this bolt that requires loosening before dialling up the tbars, some don't.
From memory if you turn this bolt clockwise you will raise the front suspension, turning it counter clockwise will have the opposite effect.
Getting the lift you want is trial and error, I normally start with 4 full turns of each bolt with the front wheels jacked off the ground, then lower it and check the difference. repeat until happy with new lift
It will affect you front alignment, a test drive will let you know if you need to get it realigned.
Cheers