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I'm assuming you want to keep the rest of the stack operational.
If not already using, you might want to consider using stack-mac persistent timer 0.
If you're running L3 on the stack, you might want to enable NSF. Also if you're running L3, and stack master is active, is there another stack member with same feature license to take over?
If the master is still active, you can just power it down (also assuming you're using a dual ring).
You can then replace it, as you would any other powered off stack member. Additional considerations apply if it's a different model. It's ideal if replacement, also has same IOS version and license, but they don't always have to agree, especially license. Again, though, if they do not, additional considerations apply.
Once the replacement is inserted into the ring, power it up, and it should join the stack.
If you want the replacement to become the active master, you'll need to at least bounce the active master and insure the replacement will win the stack master election.
