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Power will need to be off, Most single and double pole breakers pivot out. If it is the 200 Amp breaker, their may be a screw going through breaker into panel. What breaker?
It is posible to get hurt if you don't know how to properly change this. While it can be simple please understand that warning you not to try it can be good advice also.
Presuming this question relates to your other post asking about installing a 220v 2 pole breaker as well (and ignoring for the moment that you can easily kill yourself doing this)
If you need to replace a breaker, they are simply held in by the screw that attached to the back metal bar you will see running along the back. Remove, tilt, and left out (having first removed the back wire that take the current off into your home). Readily available replacements can be found at the hardware store. Please keep in mind that lethal voltages still exist in the box even once you have turned off the "main" breaker, and dropping a screwdriver can be deadly here.
If your motivation for doing this is to install a 2 pole breaker for your 220v needs, it is very likely you will also have to remove and replace an existing breaker so that the new 2-pole one can be installed. Take a look at what you see at the hardware store, or whatever is in your box today (perhaps the stove of AC fuses), notice that the 220v volt ones mount to both sides (both supply bars) in such a way that they need an open position on both sides. If you do have to move things around to make room, be sure to update the documentation on the panel
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