You can click the Activeness tracker at the top of your screen. To the left of the tracker icon, you'll see a section titled "step count" with your current number of steps.
Alternatively, you can click the "Timeline" button at the bottom of the screen and get both your step count and activity history.
Finally, you can click “Reports” under the hamburger menu which will take you to the water log report. Here, you can slide to the left to view your steps. For weekly and monthly reports, you can make a selection from the buttons at the bottom of the screen.