Edit by @Corinnebelle This option is not available immediately when you sign up as a new user, try interacting a little bit with forum and you will be able to access more features.
To link your Duolingo/Duome account to your forum profile (changes the text in your profile info into a link — see example in my profile):
- Go to the edit profile page.
- Under the "Duolingo Username" field, click "Link account".
- Copy the provided text to your clipboard.
- Replace your “Name” in your Duolingo profile with the copied text, then click “SAVE CHANGES”. Make sure to keep a copy of the old name so you can change it back once you’re done!
- Click the button to verify.
- Once you’ve successfully linked your account, you can change your Duolingo name back.