Here are a few simple steps you can take:
Create a context. It may be the title of a book or the name of an author you want to translate.
Select the language.
Upload a PDF file with the text you want to translate.
Start your work by adding words and comments.
You can add a word by highlighting it. Once you highlighted it, you’ll see a plus sign. By clicking on it, a window will pop up.
In that window, you’ll see links to online-dictionaries. If you click on one of the links, it will lead you to the word whose translation you want to add.
You can easily save your work by downloading either all of your words or just a particular context so that you can use it offline.
Once the word's translation is added, you can see its meaning without clicking on the word. Just move the cursor on it, and a small window will appear. Make sure that you chose the right context above.
Soon enough, you will notice colored highlighting of added words. Green indicates that a word has been translated. Orange indicates a word that has both a translation and a comment. You can always change your translations or edit your comments.