Ensure the two bolts extending up from the rough-in area are aligned with the bolts on the bottom of the two toilet pieces as you are installing. Position the bottom, bowl section of the toilet over the townhouse's rough-in area so the two bolts extending up from the rough-in match up with the bolt holes on the bowl section's bottom. Slide the bowl section onto the bolts so the bolts slide up and through the bowl.
Loose nuts and washers on a 6-liter toilet's bolts can cause the toilet to be installed incorrectly and may result in the toilet being offset. Fix this issue by returning to where the two bolts extend up and out of the toilet's bowl section. Use an adjustable wrench to tighten the toilet's included nuts and washers over the bolts.
Tighten screws once the tank section is added to the bowl section, otherwise, the toilet may remain offset. After the toilet's tank section is placed onto the bowl section by aligning the bolt holes on the bottom of the tank section with the two bolts extending up from the bowl section, use a Phillips-head screwdriver to tighten the screws on the outside of the tank. If you neglected to do this upon initial installation, return to the tank section and make the adjustments to the screws as necessary.
Find the water shut-off valve at the bottom rear of the toilet. The toilet may not be flushing correctly or have any water running to it because you may have neglected to open the valve. Turn this valve counterclockwise to open it.
Find the coupling on the bottom left side of the toilet's tank section. The water supply tube already should be inserted into the coupling here. If there has been leakage around the coupling and/or a loss of water pressure, you need to tighten the coupling over the tube using an adjustable wrench. Twist the coupling clockwise with the wrench to tighten it and alleviate the problem.