If you've already added a prayer, the 'new prayer' button will now be showing as 'start prayer'. You have a couple of ways to add more new prayers.
The quickest way is to top the plus icon in the top right hand corner of the page.
This takes you into the create a prayer page where you can add your prayer title, notes and image. When you're done, tap the tick/check box to save your prayer.
You can also add more prayers from the 'start prayer' button.
Tap the 'start prayer' button.
And then tap the 'add new prayer' link.