syntax, hierarchy and teminology

my problem is with question #4 of this code challenge. It seems to be a fairly simple and straightforward question, however I seem yo be making a fundamental error. I know that syntax is everything, having cut my teeth in the days of DOS. For example, in the previous code challenge, an errant semi-colon where a colon should have been was my stumbling block. (SYNTAX error) This code is very easy to learn but hard to commit to memory. I have found that i can find answers by breaking down the question. EXAMPLE: "Select the list items in the un-ordered list within the nav element and set......." OK. I go to my CSS but dont see this rule so I simply create it via : nav ul li {}. However, in the past, the word "SELECT" in a code challenge question meant to 'append to an already existing rule. In this case the confusion arises being asked to edit/create (?) the anchor element in the navigation section of the CSS when a "nav a" rule already exsist containing only the "color" attribute. When appending the "margin" and "list-styyle" attribute to this already existing rule failed, I wasnt suprised. And wrote it of to the cascading nature of css. Being the vet of literally 1000's of batch files, I know how important these rules are. Or could my problem be terminology? Multiple views of the video adds no new information. Nick just says, " Im gonna scroll down to here and....." Be advised : Inm sure Im the problem here and not you. And please do not detect any sort of negative tone from this message. Im having an AWESOME experince here. Im just trying to help you help me. Michael Bowen dosmonger@juno.com