Guide
If someone gave you an address like flying-raw-tuna.play.eytak.com, it goes into Minecraft, not into a web browser. Here is where.
Launch the game and click Multiplayer on the main menu.
Give it any name you like — the name is just a label in your own list.
Put the address in the Server Address field exactly as it appears, with nothing after it. There is no port to add: it is part of the address.
Click Done, then double-click the server in your list. If it shows a red X, wait a few seconds and click the refresh arrow — a sleeping server takes a moment to wake.
Eytak servers start in about a minute, sleep when nobody is playing so you are not paying for an empty world, and come with an address like the one above instead of an IP and a port.