This I figure is really simple ..guess I am stupide But I was looking at my Joomla Gallery and for the life of me I could not find the image Id to use with the plugin...

Help me I am an ol Fart

Thanks

Now you'll never forget it 

And for the people that get here after they search and don't know where to find it:
imageid: Backend > Components > RSGallery2 > Items: use the number from the ID column

This information is also in the details found in the Plugin-Manager: Backend > Extensions > Plug-in Manager > [Select the RSGallery2 Single Image Display plugin and edit it OR click on its name] > In the Details section there is information, such as where to find the id, with examples.