You wire the power supply to the battery terminals in the camera, and run the wires through the little covered hole in the battery compartment hatch that almost all of them have, even though they never produced a battery eliminator that fits the damn things!. Put a switch and fuse, around 1.5A, in line as well.
Eh? They've made AC adapters for the IXUS/PowerShot range. You get a little dummy battery with a socket on the bottom and a brick on a leash PSU that plugs into it via the hole in the camera. I used to have one for my old IXUS but I've since upgraded and they changed the battery shape slightly.
Like this
AC adapter suitable for NB-6L batteries. It is pretty expensive though and you need to get the right one for your type of battery.
Third party adapters also exist.
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