Rooted, but Failed to push selection: Read-only file system I rooted my Alcatel OneTouch S'Pop using an exploit app Framaroot.apk. 
When I tried to push a file to /system/usr/keylayout/Generic.kl using Eclipse's File Explorer, I got this error:

[2015-01-06 23:00:29 - ddms] transfer error: Read-only file system
[2015-01-06 23:00:29] Failed to push selection: Read-only file system


Pulling the file has no problems and I edited it to remap my camera button as a power button because the power button doesn't work well.

Could this be because the exploit method wasn't a good idea or do I somehow have to change the system folder to be R/W? And how do I do that?
You have to remount your /system partition be mounted as a read/write partition

What you need to do is 

$ su

# mount -o remount,rw /system