The city can be navigated with one or two fingers. Slide the screen with one finger to move around the city. Place two fingers on the screen and move them in the same direction to tilt the camera's angle. Place two fingers on the screen and pinch it to zoom in and out. Pinch all the way out to switch to an overview, and tap the screen again to return to its default position.
Quests are listed on the left side of the screen, and tapping the Quest icon will open the quest log. Some quests are directly tied to the story and must be completed first. Others are optional or event related quests that are not required, but offers lucrative rewards.
You will be granted the ability to create additional bases by completing quests and expanding your city. You can navigate between the different bases by tapping the Base icon and choosing the base you want to view. In addition to the coordinate for each base, its "Field HP", population, and monster capacity is shown here.