When you start the app for the first time, HappinessPal will welcome you and give you the choice to jump right into it or take a tour first.
The “Take a tour first” will open this very website. Tapping on “Let’s do this!” will lead you to the next view.
Here you can select which of the “Big Seven” activities you would like to practice. This is only a first selection. You can always change and finetune the activities (e.g. set the days you would like to practice them) in the settings of the app.