when you start a terminal your "at home" or short ~ ^^

"cd .." -> go to parent folder
"cd foldername" -> open folder with name 'foldername'
"ls" -> list of files/folders in actual folder
"ls -a" -> same as above + show hidden files/folders

attention: linux is case-sensitive! so "folder" isn't the same as "Folder"

so type in "cd .config/sibplayer/"
(use the tab shortcut after .c and /s to autocomplete ^^)

to remove the file use "rm SiBPlayer.conf"
(here you can use tab after S as well)

to edit the file use "vi SiBPlayer.conf"
once the file is open hit Escape.
then tap i on your keyboard (stands for insert).
navigate with cursors to the place you want to write and just write.
when you're finished tab Escape again and ":wq!" (for write&quite+force).
(as you can imagine Escape triggers between option-mode and edit-mode)
you can install a non-terminal editor too - as the next posting will say - but vi is pure linux. *laughing*

EDIT: of course someone was faster, but i think this could give you a short instruction to the terminal navigation. ^^