1) The title/topic of this thread is stupid - next time use a descriptive
title, that way you'll get more (or better) interest.
2) Don't use teenager fool language, like "may b" or "r u" or "plz" or "lol" or "omg" or such. It's just stupid, non-informative, irritating and slows down reading and understanding - and causes some people not to read your post, not answer to it, just tell you to learn how to write properly before starting to show off.
3) $PATH is an environment variable which contains some directories (for example when you type in an executable name without full path, it's searched from the directories in $PATH). You can see it's contents like this, by opening a terminal:
Then you can change your current working directory to one of those with cd:
Have a look at linuxcommand.org for more information about shells/command prompt, and some English language books for more information about how to express yourself publicly.