At the moment, you can contact technical support in the following ways:
Live Chat. There is a chat room in the app. You can write to it and get help. The response time is usually up to 10 minutes.
Telegram. Telegram also has technical support, but it responds a little less frequently than Live Chat.
Email. Just write to the bookmaker’s email and a Nagad88 app worker will reply to you with instructions for solving problems.