When you are in the story detail page, the story menu appears.
If you click the Practice menu, you can use a dictionary search, image search, memo writing.
If you double-click a word, dictionary search is done and if image search checkbox is checked then image search is done, and in the memo area, the word appears.
If the memo is added or modified, you must save the note before leaving.
The double-clicked word is saved automatically, and you can see it in the Words menu.
In the Words menu, you can add, modify, delete the words.
Whenever while you are reading, on PC double-click the word, on Mobile tab holds the word that you didn't know, then it is saved automatically.
Use the bookmark when you are leaving, select a word and use the BookMark menu button on the top menu.