Click multiplayer to open your Minecraft multiplayer server list.
In your multiplayer server list, select the server that you wish to modify. Preferably BartyRealms.
Click on the "Edit" button that is now available at the bottom of your screen.
Change "Server Resource Packs" to "Enabled".
Now whenever you conect to our server you will automatically download our resource pack and will be able to play! Have fun!