If you want to change your level of Words or Sentences, you have to:
1. Go to the "More" tab.
2. Tap on the "Levels" menu option.
3. Select the level you want to study for: Words or Sentences.
Note: If you have a valid subscription (Premium or with flowers) you will be able to choose any level. If you do not have a subscription, you will be able to choose just the first level.
How do I subscribe?
Can I subscribe without money?
How do I select multiple levels at the same time?