You can select any empty town slot on your land and then click open the Invitation Pop-up:
Click Invite Player button and provide the player ID (for existing players) or provide an email address to invite someone new to join the game. Please note that you need to copy the generated invitation text and send it to your friends via email. Medieval Empires cannot send any email without user consent.
Hi my dear friend,
Big news! I'm now a landowner in Medieval Empires and I want you to join me in the game! 🏰 Let's build our empires, conquer territories, and kick some virtual butt together! 🌍💪 Are you ready for an epic gaming adventure? Let's do this! 🔥
Follow this link to sign up on Medieval Empires