You can. But there are two types. There are FSAs and HSAs. Here you go for some background
http://www.dailyfinance.com/2014/11/18/fsa-vs-hsa/
__________________
Sent 10/19->WAC accepted 10/24
I-797 arrived 10/27
Biometrics letter arrived 10/29 Biometrics done 11/20
EAD: February 7, 2013 SSN:Already Have 
DL:Gonna take a month or two..haha.never bothered to learn..too scurred