need help w/ something technical

Ok this isn't diet related..
I want to add cute graphics when I send a booster..but I can't figure out how.
I know about codes and stuff and usually you have to select "view source" to enter in the html but I don't see that option.
I usually just very easily, on myspace for example, just copy and paste the code..but that doesn't work for me here..
any help?
thanks in advance!