See page 89 of your user manual.
On the 4-way navigator buttons, the left button (left of the "Set" button on the back) is the Drive button which accesses the menus to set the drive mode. There should be a choice that shows a clock with a "2" in the corner (2-second delay). The clock with no number displayed is the 10-second delay.
I'm not sure which IR remote you have. If you are using the Canon RC-6 remote, there is a switch on the back of the remote (not on the camera) that switches between immediate mode vs. 2-second delay mode.
If you put the camera in 2-second delay mode, but then tell the remote to use immediate mode, the camera will actually take the photo immediately.
The benefit of the 2-second delay is that it gives you just a moement to hide or palm the remote when taking self-portraits so you don't end up with photographs showing a remote pointed at the camera.
Tim Campbell
5D III, 5D IV, 60Da
