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Hello @MisangT, it's a pleasure for me to welcome you to the Community!
In order to add the Hourly Activity tile on your online Dashboard, click on the menu icon located to the left of your tiles, then check the box for Hourly Activity Goal and click on Done.
To add it on your the Fitbit app on your phone, open the app and scroll all the way down, tap on the Edit button and if the tile is hidden you'll be able to see a pink plus sign on the top left corner of the tile, tap on it to add it and make it visible, then tap on Done.
I hope this information had been useful, give it a try and keep me posted in case you need anything else. 
Best Answer