Unfortunately, your options are limited. If you want to send a message to another user, you could comment on one of their videos. Commenting on someone's video is the most efficient way to let them know you'd like to communicate. Another option is to check their profile for links to their other social media sites. For example, most users link their Instagram accounts. If you see one listed, tap it, and send a message through Instagram. Lastly, check the user's Profile for a Linktree. If you're trying to contact a large creator or business, they likely have links to external websites or social media in their Linktree. If they do, send a message on one of those platforms.