Step 1. Tap + on the Missions block.
On the Dashboard, find the Missions block. Tap the +.

For things you have planned. Break it into levels. Say how much each level counts. Tick levels as you finish them and watch the bar fill, all by itself.
On the Dashboard, find the Missions block. Tap the +.

Type what you want to do. For example: "Learn guitar".

OnceWrote says: "You can add more than one level." Tap Add level.

Write the step, for example "Buy a guitar". Under it, move the slider to say how much it contributes to the mission. The screen tells you how much is still free, for example "24% is still free". Tap Save.

Tap Add level again. Do the same for each step. For example: "Learn 4 basic chords". "Play one song". Together, your levels use up to 100 percent. The slider stops when no percent is left, so you cannot go over.

Your mission shows a ring with the percent, and a bar under its name.

Tap the mission. A popup shows all your levels. Tap a level to tick it when you finish it. Watch the ring and the bar move. The popup also tells you, for example, "2 of 4 levels done".

When every level is ticked, OnceWrote asks if you finished. Say yes, and you can save it as a win with today's date. If not yet, it goes back one step.
