Step by step
Create a bot through Telegram's official BotFather. Keep the token private. Add the bot as a channel administrator with the permissions needed to publish.
Choose Telegram in Publication channels. Enter a connection name, bot token and channel username or numeric ID. Save and check access. Connection checks do not publish content.
A standalone post scenario needs no website, article or article link. You can also adapt an article, with or without its public link. Review the selected channel and publication mode before sending or enabling a schedule.