what I want say that, people are saying something about 60%dev tax or similar,
Let me clarify that,
There is no such thing,
everyone is free to run his fundamental nodes, and the help was already there , if you even need help in running it .
First, Do fundamental node payment , by clicking on"Fundamental node Payment" check box(available at send on right bottom) and send exactly 25M +1 coins to yourself,

Second,  Wait for 15 confirmations of this transaction .

Thrid, When this 15 confirmations reached ,then goto Help->Debug->Console, and type "fundamentalnode genkey" inside rpc command
This will out a private key, copy it,

Fourth, This step is for b3coin.conf file ,
Paste this in your conf file



rpcallowip=127.0.0.1
rpcuser=YourUserName
rpcpassword=YourRPCPassword
server=1
daemon=1
listen=1
fundamentalnodeaddr=YOUR_IP: 5647
promode=1
fundamentalnode=1
fundamentalnodeprivkey=KEY GENERATED BY THIRD Step.


Firth,  After pasting this (from step fourth) in b3coin.conf file , go to help->Debug-> console
and type
fundamentalnode start
hit enter. and your fn will be running