First of all, you should determine the exact name and location of the command you want to execute. Are you sure you have the right command name? I don't see "emulator" in the output above, so it's not in /bin, at least. Check /usr/local/bin, for example, or try running a locate/find command.
Second, what is your current path? "echo $PATH" will print out your current path settings. Note that your path may be set differently for different users; root especially usually has extra directories such as /sbin added to it.
Once you know what directory you need to add to your path, the command itself is rather simple.
This will add the new directory to the front of the current path string. Note that this is only good for the current shell though. To make it permanent, you'll have to edit the PATH string in one of your shell startup files, usually ~/.bashrc for individual users, or /etc/bashrc for global settings, but this could vary.
(We're assuming bash here. If you're running another shell the syntax for setting variables may be slightly different.)
Alternately, you could just create a symlink from your executable in one of the directories already in your path.
Finally, you do know that this is a common question that's been asked and answered thousands of times before, don't you? You could've just done a quick search here or in google and found the answer.