Oh, I see. I can definitely help you with this! 🙂
When you open up the Fitbit app, from the main dashboard, scroll all the way to the bottom and tap on the button that says Edit. Then, go back to the top and the steps tile must have been disabled, so just tap the pink button with the plus sign on it and it should add it back. You can also re arrange the tiles as you wish and when you're done, scroll back to the bottom and hit Done.
Hope you find this helpful and if you need anything else, I'm always around!
Ps. I've moved your post to the iOS app board for categorization purposes.
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