Once you get the reserve skill, on the hero screen there will be one (or two) small boxes to the right of your five active troop slots. Alternatively, on the main screen, there will be a small triangular icon above yout last active troop slot--clicking on this will display the reserve slots. On either screen, to move troops between active and reserve slots merely left click on the troop and then left click on the slot to which you wish to move it. If there is already a troop in the second slot, they will be swapped.
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