from cmd :   x2-qt.exe -addnode=XXX.XXX.XXX.XXX
or via conf.file    addnode=XXX.XXX.XXX.XXX

but it makes no differene which way you select.


the best/fastest way for you to catch up the blockchain
would be, if someone upload his bootstrap
even a few thousand blocks are a pain in the ass.
if you download it normal.