Problems with some of "My Content"

Apologies up front, I am new to all of this. I am trying to build a map using the Flex application builder 3.0. I managed to make one with a zipped up shapefile that I uploaded onto our organizational account. My problem is this: I managed to publish a map to arcgis online from my .mxd, it showed up as a Service Definition file type, and when I open up the flex viewer, I cannot see this map under "my content" of operational layers. Is there a step I'm missing? Do I need to publish the map once it is in arcgis online in order for me to be able to see it somewhere in flex, be it basemaps or operational layers? I do not have ArcGIS for Server. If my question is unclear feel free to ask for clarification. Any help will be greatly appreciated.

thanks.