Congrats in advance on the new baby.
Because your Jeep does not have lower LATCH anchors in the vehicle's rear seat crease,* you would need to install the infant seat, or any other type of carseat, using the vehicle's seatbelt, not the carseat's lower LATCH anchor connectors. The top tether anchors in your Jeep are intended to be utilized by a top tether strap on a forward facing harnessed carseat, way down the road when your little one outgrows a rear facing convertible's rear facing limit.
You would need to follow the seatbelt installation instructions in your infant seat's manual to achieve a proper installation of the base in your Wrangler. You could also try to locate a Child Passenger Safety Technician in your area to check out your installation through the list of techs who are members here on Car-seat.org at
http://www.car-seat.org/showthread.php?t=59135
or through the Safe Kids technician locator at
https://ssl13.cyzap.net/dzapps/dbza...tegory1=TAB9_CERTSEARCH&Webid=SAFEKIDSCERTSQL
*Just for reference, Jeep Wranglers weren't factory equipped with lower LATCH anchors until the 2003 model year, and older models such as yours cannot be retrofitted with lower LATCH anchors.