You can add languages to your profile under your profile settings, or navigate to the Menu → Profile Settings → Language Abilities.

Note: The button will be inactive if you have listed 4 languages on your profile. In this case, you will need to remove a language to add a new language. However, we don't advise you to do this frequently.

You can add up to 4 languages (a maximum of 2 native languages). Remember to save the changes you make in your profile settings.

You can delete languages from your profile, or navigate to the Menu → Profile Settings → Language Abilities.
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To remove one of the languages, click on the delete icon next to the language you want to remove.

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I Found the Language I speak, but not the Appropriate Region

How do I know which Language Level to choose?