To get a credit card, you need to go to coign.com and sign up for a coin card by clicking the Join Now button. 2. You can contact Coign's customer support team to obtain the card, which can be reached at help@coign.com and 833-690-247 Monday through Friday, 8 a.m. to 5 p.m. 3. You can join the Coign app by downloading it from the Google Play Store.