To send a message to Coinbase, go to their Help Center on the website or app. Select "Contact Us 𝟣-𝟪𝟥𝟣-𝟩𝟢𝟦-𝟪𝟪𝟣𝟩," choose your issue category, and either use live chat or submit a support request via email 𝟣-𝟪𝟥𝟣-𝟩𝟢𝟦-𝟪𝟪𝟣𝟩.