We just installed a toilet this past week. Our old toilet was about 30 years old. The water level in the new bowl is quite low. How can I raise it so I don't have to flush 3 times after use?

We just installed a toilet this past week. Our old toilet was about 30 years old. The water level in the new bowl is quite low. How can I raise it so I don't have to flush 3 times after use?
Set the tank level 1/2" below the top of the white overflow tube and make sure the small plastic tube from the top of the ballcock to the overflow tube. This must be connected to the overflow tube to insure the level's correct. Good luck, Tom