1. Go to http://maplestory.nexon.net/
click SIGN UP, IT'S FREE!
2. Fill in the information needed and click done! then go to your e-mail and verify your account.
3. When you account is verified you will go to this page and click downloader.EXE
4. The MapleStory Downloader will come out like this, let the bar load until finish and install Global Maple Story to your computer
5. While waiting for the downloader to finish, you must download this program to play Global Maple Story, this is an IP Changer. Go to http://www.anchorfree.com/
and click Download Hotspot Shield.
6. After downloading the Hotspot Shield, install it to your computer. Beside your computer will have this Small Icon. Right click it and click (Connect/ON)
7. After clicking (Connect/ON) you will go to this page says Connected
8. When the Hotspot Shield is (Connected/ON) you will have this
9. After downloading all the program including (Global Maple Story & Hotspot Shield) Go back to http://maplestory.nexon.net/
and type your ID / Password that you SIGN UP here
[Note] Please remember to (Connected/ON) your Hotspot Shield everytime when you want to play Global Maple Story.
10. Then click LOG IN
11. So now you have opened Global Maple Story. Select a world to play and create an character. When you click Start, it will pop up (You must register a Personal Identification Code (PIC). Please create your PIC.) then click OK
12. After that you will have to use your mouse to click your own 2nd Password known as (PIC) then click OK
13. After clicking you have to retype again to confirm your 2nd Password known as (PIC) then click OK again
[Note] Please remember your 2nd Password (PIC) because every login must type your 2nd Password (PIC) when you want to enter the game
14. Well congratulations! You have login to Global Maple Story! Happy Mapling!
This mini guide taken from x3thearan59 forum, refer here for more details: http://www.x3thearan59.com/t725-guide-to-play-global-maple-story