I am assuming you are referring to edge labels. Select the label you want to place close to the source or target node. If you are using "Placement" policy "SmartFree" simply drag the selected label to the desired location. Otherwise, choose a policy that supports the desired location. E.g. policy "6 Pos" support "Source Head", "Source Tail", "Target Head", and "Target Tail" (in this context "Head" means to the left of the edge when facing in edge direction and "Tail" means to the right of the edge when facing in edge direction).