Monticello and merging

Hi,

I have some problems trying to merge with monticello.
If I merge I get a list of all changes from the actual
version to the selected version. For every entry in the
list I can press keep or reject. But I don't know how
it is supposed to be used. For me it shows no effect at
all pressing each of the buttons.

A little explanation would be great.

regards,

Norbert