Insert two minipages next to each other. Do not press enter between the two or you will start a new paragraph and the two minipages will appear one under the other.
Adjust the minipage width settings by right-mouse-button clicking on the [minipage] inset label. If you want to make the minipages look spaced evenly you might try Insert->Special_character->HFill between the two minipages (and possibly on both sides. The key trick though is to ensure they are in the same paragraph. Allan. (ARRae)
