There are two ways to access the dictionary. You can access it directly by going to the Dictionary section in the menu. There you will see the latest additions to the detailed illustrated dictionary (feel free to open any of them).
You will also see a search box. Start typing to see suggestions and click on any suggestion you would like to know more about.
When you are reading a text, there is no need to use the menu. When you click on a word, you will see its lemma in the blue row. Simply click on the lemma to open a small window with the dictionary definition.
No matter how you access the dictionary, you can always click on any word in any example sentence. Using the example sentences to save words is the best way to master all meanings of a given word.
When a dictionary entry has been opened, you will see a little yellow checkmark in a link to it in the dictionary section. You can access all your read words by clicking on the icon on the home screen.