How can client connect to my Dedicated server online?

One level world and all I want is that the players using the client version of the game when entering directly connect to that one dedicated server. Already made the dedicated server and client tested on Lan and works fine but I dont need Lan connection I want it online. Please someon give me a answer Ive been searching for days and all Im finding is Steam connections and this is just a simple android “game” that I want players to connect to my pc server to, thats all.