That is correct- use the right justified tab. (On my screen, the message with the numbers were aligned with the center of the numbers, not the periods.) The right justify tab is labeled Align Right.
Just below are some dropdown boxes that also let you adjust some spacing- ie. space between the numbers, how close to the edge your numbers are to the text box... Just select them and play a bit. Much better than using spaces and tabs to finetune your spacing.
Nick