How to modify/edit Rom which you are using

I love android because you can do lot of things ...
now some of you guys want to customize your Original rom.
but don't know how?
i will tell you...
1st thing it is full of risk because it can cause boot loop ....
but chances are 1 in 100.
So first thing your phone should be rooted....
Now for editing rom i love a app name xpose installer....
this app help you lot....
download xpose installer from any site( google it)
if it is in zip or rar format then install it via TWRP, CWM or any recovery.
after installing it download Monster UI from play store and install it ....
after installing open xpose installer
Click on framework

Then click on install/update. It will ask to Give root permission ,click yes