Proc univariate histogram

[CHELS]

Trying to create something similar to the following whereby the legend for the red and green line is within the box. 

However, using the code I have, the legend for the line still appears by itself:

proc univariate data=Score noprint plot;
var Predp;
class AAA;
histogram Predp /
kernel (k=normal color=green c = 0.75 l=1);
inset n ='N' (comma6.0) mean ='Mean' (6.2)
median ='Median' (6.2) mode ='Mode'(6.2)/ position=NE;
run;

[Rick_SAS]

I see you are using 

CLASS AAA;

Is this part of a comparative histogram that appears in a panel?

[CHELS]

Yes, so there are two stacked histograms and I want to compare between the two. 

[Rick_SAS]

But then where do you want the legend? 

My advice is to suppress the legend by using the NOCURVELEGEND option and then add the kernel C= value to the inset. Here is an example:

proc univariate data=Sashelp.class noprint plot;
var height;
class sex;
histogram height / NOCURVELEGEND
        kernel (k=normal color=green c = 0.75 l=1);
inset n ='N' (comma6.0) mean ='Mean' (6.2)
        median ='Median' (6.2) mode ='Mode'(6.2) 
        KERNEL(C) / position=NE;
run;

[CHELS]

I want the legend for the curve to be inside the legend box together with other estimates (N, Mean, Median etc.). Actually, it doesn't make too much of a difference where that curve legend is but I am trying to follow an output template that requires it to be inside the box. 

[PGStats]

You could go for proc sgplot (more graphing options, fewer estimation options)

proc sgplot data=sashelp.heart;
histogram cholesterol;
density cholesterol / group=sex type=kernel;
keylegend / position=topright location=inside across=1;
run;