I can't find the "MobileSync" folder

[93MPH]

I'm trying to fix my MMS problem due to upgrading to 4.0 while my phone was jailbroken (I already fixed the Cellular Date problem). In one of the threads here theres a way to to fix it, I need to ~/library/application support/mobilesync/backup. I clicked on the Macintosh HD icon on my desktop > Library > application support then I can't Find "mobilesync" folder!
Am I doing something wrong here?! I really want my MMS back..

 

[Davvido]

Try /User/XXX/Library/Application Support/MobileSync/Backup/

 

[93MPH]

it worked! thank you so much!