hello i was wondering how i can change the titles on the modules for example i want k2 archives to just be archives,k2 user to just be user and k2 comments to just be comments

ive tried changing the name through module manager and hiding the title as well but when i click save it doesnt save and reload like its suppose to,the save button doesnt do anything

This sounds like an issue with your Joomla! installation.
K2 Modules works just any other modules.

Make sure you are using Joomla!'s latest version and K2's latest version as well.

Yeah i made sure i got the latest version of both installed,but still for some reason i cant change the title name of the K2 modules

for example i would like K2 Archives-->Archives instead of having the K2 in the name

This sounds more like a Joomla! issue.
You can change each module's title from Extensions-> Module Manager -> Select your module -> Edit the title field.