[Q] Installing/changing system apps?

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I am trying to put a minimal theme by Classicalgas and am trying to install the port for Genie Widget.. it edits News and Weather app that is a system app. I am running CM 6.1 stable.

Everytime I run the apk it will say would you like to replace system app. I say yes.. itll try to install but will say app not installed.

Any advice?.

There is the system r/w overlay, but I'm not too familiar with it.
I find it easier to just go into clockwork recovery and do everything via command prompt.