If you want to translate, for example, a post you must go to the post area of the source language you are going to use for the translation. In this example we are going to create a post in Spanish and translate it into 3 languages at the same time: Catalan, English and French.
Firstly, go to the section of the post and fill in a new one.
Activate all the languages you want to translate and create their corresponding categories. The title, slug, excerpt and description will be automatically translated.
Once created (published or draft), you can get access to them directly from the link of each language.
There, you should see the translated elements.