Create a Stream
Open Telegram, and visit the @text_stream_bot.
Send it the /start command, and wait.
Do what it asks you to do.
Send a message to the bot you signed up from to make a post to your Stream. You can use Markdown formatting, add images, and edit posts from the app itself.
Look at the full list of Features to know what is possible with Streams, and check out the Guide for advanced usage.