Try adding the U47 into your mods folder (located at %appdata%/.minecraft/mods) then start up your minecraft with forge 1.12.2 (It wont work with any other version of forge [thats U47 though]) then click Dalek Mod Servers then click 'DMU Public' and to access DMU Private you need Beta Access which costs $3 and can be found Here and to access DMU Creative you need Creative Pass and can be found Here. And if all of that fails maybe try waiting for DMU Staff to help.

 Click HERE to get Update 47. Put this file in .minecraft/mods and if there is no mods folder, make one.
Click HERE to get the needed Minecraft Forge version and install it.

Open up your Minecraft launcher and select the Forge profile.

Launch the game.

This should be all you need to do :D

when I join it says failed to verify username, i have tried removing other mods ,turning on and off wifi and shutting down minecraft. Any help?

Please dont necropost, this thread is over a year old.   The solution to your problem is to completely close minecraft,  close the launcher, then re-open minecraft