Canon eos rebel t1i - Manual (Page 190)

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Under the My Menu tab, you can register up to six menu options and
Custom Functions whose settings you change frequently.
1
Select [My Menu settings].
Under the [9] tab, select [My Menu
settings], then press <0>.
2
Select [Register].
Select [Register], then press <0>.
3
Register the desired items.
Select the item, then press <0>.
On the confirmation dialog, select
[OK] and press <0> to register the
menu item.
You can register up to six items in My
Menu.
To return to the screen in step 2,
press the <M> button.
Sort
You can change the order of the registered menu items in My Menu.
Select [Sort] and select the menu item whose order you want to
change. Then press <0>. With [z] displayed, press the <V>
key to change the order, then press <0>.
Delete / Delete all items
Deletes the registered menu items. [Delete] deletes one menu item
at a time, and [Delete all items] deletes all menu items.
Display from My Menu
When [Enable] is set, the [9] tab will be displayed first when you
display the menu screen.
3 Registering My MenuN
About My Menu settings