Canon eos rebel T2i - Manual (Page 68)

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In the Basic Zone modes, all the AF points are active. Generally, the AF
point covering the closest subject will be selected to focus. Therefore,
the camera sometimes may not focus the subject you want.
With the <d> (Program AE), <s>, <f>, and <a> modes, you can
select one AF point to focus where you want.
1
Press the <S> button. (9)
X The selected AF point will be
displayed on the LCD monitor and in
the viewfinder.
When all AF points light up, automatic
AF point selection will be set.
2
Select the AF point.
Press the <S> key to select the AF
point.
While looking at the viewfinder, you
can select the AF point by turning the
<6> dial until the desired AF point
lights in red.
Pressing <0> toggles the AF point
selection between the center AF point
and automatic AF point selection.
3
Focus the subject.
Aim the selected AF point over the
subject and press the shutter button
halfway to focus.
S Selecting the AF PointN
COP
Y