First, decide on the plot. It could be a love story, an adventure, or something completely different. Then, create your characters. Think about their personalities, names, and how they would interact in a texting conversation. Next, start writing the dialogue as if it were real text messages. Keep it short and to the point. For example, if it's a love story, you could start with 'Hey, how are you today?' and build from there.
To start writing your own free online texting story, you need to find your inspiration. It could be from your own experiences, something you saw on TV, or a dream. Once you have an idea, outline the basic structure of your story. Who are the main characters? What's the conflict? Then, when you start writing the actual texting parts, use abbreviations and emojis like people do in real text messages. This will make it more authentic. You can also add multimedia elements if the platform allows, like pictures or links to relevant things. For instance, if your story is about a concert, you could add a link to a song that's important in the story. Don't forget to proofread your work to make sure it's clear and engaging.