Creating a Double Bar Graph With Provided DataSet

To the volunteers of R-Help.

Hello, I am currently stuck on an RStudio assignment. The assignment
involves creating a double bar graph with the provided info

http://math.fullerton.edu/mori/data/introstats/pennstate3.txt

My professor has only gone over the very basics of RStudio and we only
learned how to make a simple bar graph and labeling x and y axis. The
specific directions from my professor:

Draw a side-by-side bar graph of the variables WtFeel and Sex. The x- 
axis,
should include the variable WtFeel, and the side-by-side bars should  
be the
Sex categories. Color Males by blue, and females by red. Also, give a
legend and a title for your graph.

I know how to do the labeling and coloring of the graph, but the  
actually
plotting of a double bar graph eludes me. I do not expect a full-on  
answer
(though it would be nice), but at least a guide on what to do  
because I am
so lost.