Using proc glm with excel data set

[maonome]

Hello,

I have a data set imported from excel that I cannot figure out how to make it do an ANOVA on.

vertically I have different sites (sampled in different months) and for each site there are 6 numbers in different cells horizontally. what I want to do is compare sites by using the 6 numbers (they will make an average/stdev etc). (if different will follow up with Tukey ettc)

below is the code I have, but I don't know what y should be. I have tried labeling each of the 6 columns and listing each of them where y is. or do I have to enter the data manually into SAS?

proc glm;
where month = 'August';
class Site;
Model y = Site;
run;

thanks for the help