can you help me with installing custom ROM?
I supose you have unlocked your bootloader with the link
@popthosegaskets provided. Now just head over to:
http://forum.xda-developers.com/showthread.php?t=2320872
and pick a ROM that suites your needs. Every ROM has its pros and cons i guess so Id advice to scroll the posts of the different ROMs and check what features they have, what bugs are still present and decide uppon that.
Most developers suggest you a certain Kernel to be used with their ROM, and either provide you with a download link to the kernel or include a boot.img with their Kernel.zip. Additionally to that some developers request you to download some fixes/modules, those are aswell listed in the Kernel/ROM forum post. Once you have the Kernel, ROM and modules/fixes, follow the Kernel flash instructions on this forum post:
http://forum.xda-developers.com/showthread.php?t=2131284
once the Kernel flash is done, install the ROM and modules + fixes, always check the ROM forum post because some developers want you to flash modules and fixes in a certain order. You ofcourse might want to put all this files on your SD-Card and install them via CWM.