How to change the default machine settings configuration file

I had to format by computer , i am now reinstalling all of softwares i need including LB
thanks God i made a copy of my previous machine setting file and i dragged and dropped it in to working area and LB seems ok.

i imported it twice by mistake and now i have also a undesired copy (3) of my own machine setting
Point is that by default any time i open LB the software is getting back to some wrong preinstalled setup (1) and this is giving me problems.

i am not able to delete this wrong machine setting file (1) and set my own setup (2 ) as default. so the questions are :
1. how can i delete a undesired machine setting ? ( number 1 and 3 in my case )
2. how can i chamge default machine setting ( the one i need is the 2 )