[Q] how to update? topic

I installed cm version 11-20141122 unofficial bok-hummingbird on my nook hd last week and it seems to be running pretty well overall. But I am unable to sing on the Kobo Android reader app. I have an account but I can't get to the sign on because it doesn't detect the internet connection, although wireless/internet is working fine with other apps. I though a cm upgrade might help for that issue, and I wanted to update in general if that is recommended. Can i do that from the tablet or do I have to copy a file onto the nook hd and install it, similar to how i installed this version? I couldn't see anyway to do this through the tablet settings. Finally, are there any developer options recommended to generally soup up performance? Thanks