Set malloc_error_break in Xcode 4

Question

How do I set a malloc_error_break in Xcode4? Also, I seem to be getting this error malloc: *** error for object 0x4d80814: incorrect checksum for freed object - object

Answer 1

This is what the breakpoints button looks like:

And this is the plus sign at the bottom left hand corner:

Man, it took me a while to find both of them!