Drop customRanks.smx to sourcemod/plugins.
Drop ranks.cfg to sourcemod/configs (default ranks).
To make your own ranks:
Example
"Ranks"
{
"RANKNAME1"
{
"Points" "0"
"Color" "WHITE"
}
"RANKNAME2"
{
"Points" "100"
"Color" "YELLOW"
}
"RANKNAME3"
{
"Points" "400"
"Color" "DARK_RED"
}
}