If you can do it manually, then write down the bubbles in order and don't worry about the modelbuilder stuff.... the nudge being, do you want all the points that you selected in the upper model portion to be selected within those of the buffer in the lower? If so doesn't that sound like a select by location? or perhaps a spatial join? If either or, then you will know that manually, the output from one step becomes the input to another (ie your points within the buffer) (sorry,, I teach so I can only nudge...hopefully others will also nudge only )