Logging-in with your unique ID (you don't need it to play. It's just for global statistics)
If you have your unique ID from CryMP.net network, you might want to log-in with it in-game, here is how to do it:
Open the servers list (~) in game and type: simple_login name/e-mailpassword
Permanent logging-in with your unique ID (for more advanced users only)
You can also log-in permanently, that means, that each time you launch the game, you will already be logged in:
Go to folder of your game (e.g. C:\Program Files\Electronic Arts\Crytek\Crysis)
Go to folder "Game" inside your Crysis folder.
Look for "autoexec.cfg" file, if it doesn't exist, simply create one in Notepad and save it as "autoexec.cfg" to Game folder
Write simple_login name/e-mail password to the file
Alternatively, if you don't like writing your password to public file, go to your profile (you must be logged-in). See API keys and copy "secu_login" line to the "autoexec.cfg" file.
Save the file and launch the game from given shortcut on desktop, you should be logged-in.
If you don't know what does it mean to use glitches and unique skills and what is not hacking.
Many new players are not aware of all that Crysis MP gives us - sometimes they report some glitches and skills as hacking.
Some even leave the game because they see players "flying around" and "jumping too high" which looks crazy for new player.
There is always on line special server called " [FP] Jump and Fly School" for those who want to train jumping in frendly atmosphere.
Here are 3 old (2012) but HQ tutorials showing what "Wall-Jumping" exactly is, how easy you can learn this skill - and what's "C-J / Flying" (Crysis 5767) - with places to practice your flights.
Basic Wall-Jumping Tutorial Wall-Jumping for beginners - from 2 perspectives - by Freebo
More advanced Wall-Jumping Tutorial Jumping on basic IA maps - by Freebo
Basic Circle-Jumping / Flying tutorial (Crysis 5767 only) How and where to start CJ - shown from 2 perspectives - by Freebo
Here are 3 new (2016), very detailed tutorials with voiceover commentary about: Infantry Fighting, "Wall-Jumping" and "Circle-Jumping".
Basic Wall-Jumping Tutorial New, detailed WJ tutorial with voice commentary - by Youda008.
Circle-Jumping / Flying tutorial (Crysis 5767 only) New, detailed CJ tutorial with voice commentary - by Youda008.
Infantry combat tutorial How to fight on IA and PS maps, how develope great aiming skills - by Youda008.
If you are very new in this old game and you have no idea how to even start fighting...
You can check 2 classic, official tutorials prepared by Crytek in early 2007, before even game came out. Should help a bit.