simple commands ....typing them .....help

Hello
I am trying to copy and paste an icon into my "pixmaps" folder(so i can add to desktop icons)
I am using a linpus linux lite os ..(pain in butt)
CAN some kind person please tell me how to perform this simple task(in windows it was a breeze) i need the explanation to be step by step...
I have only just found the cmds for this os in "sbin" but would not have a clue which ones to use.
I realise you need to activate permissions at times, all well and good ; so i go into root BIG QUESTION.....Then what how do i navigate to the actual file to change said permissions, i am perplexed!!!!
I am only guessing that this is what i have to do... I have had this laptop for 2 weeks now and have nothing but head slamming sessions trying to get it to work and do the most simplistic things that would take 3 secs in a windows os.
I have managed to get 2 icons onto my desktop by adjusting the data in XFCE-group.exe(i think from memeory) but just want to put a "VLC" icon onto it but need to have one in the pixsmaps folder.....
Sorry for the long winded dilema but needed to explain self fully

please any help would be appreciated

regards

gary Duel