Hehe, fear no more. Help is here.
Once you run the service, you can do it by adding the & character in the end, which tells it to run in the background. Or if you have already run the service and forgot the & character, press CTRL+z and when you are put back in a command line, type bg and press enter.
This second way does the following. CTRL+Z stops the current command. And then the bg command puts it into backgroud. But it is easier to add the & character at the end of the command. However if you forget to do that, use the second way. Pretty handy trick