In the account page you're able to make an individual plan for each account. To do this follow the following steps:
Scroll completely to the bottom at the account page
You see your individual plan.
Click on 'Add individual objective'
Done! 🎉
If you want to add activities, press on the arrow on your right to collapse the objective. Then, click on 'Add individual activity'.
If you would want to add an individual sub-activity, you can do this by clicking on 'Add sub-activity in the right bottom corner' next to the thrashcan-button.
You can find a detailed explanation in this tutorial below: