With Mojo you can add your social username in any of your stories. To do so:
Click on the "+" button on the bottom right to edit your template
Select the option "Text" in the menu bar at the bottom of the screen
Scroll the text styles menu at the top of the screen till you find the category "Social"
You will be able to add your username for all social media platforms (Instagram, Whatsapp number, Tiktok username, Instagram Reels, Facebook, Youtube, Twitter, Pinterest, Telegram, Twitch, Snapchat & Linked-in) or animated cards with your contact details such as a telephone number, e-mail or website