The command to give yourself items is /gmadditem the the item id and the amount.
Assuming you already have something like nexus2 or BlastClient downloaded then go find where they are placed in your computer then go to the client file and look for something like boot.cfg and open it, it may ask something like open with and select notepad and look for this AUTHSERVERIP=0: and after the 0: put in Jonny’s server ip which is 5.230.147.129 and open LU.