I have foreign bank account but the value is less than $10000. Do I still need to file FBAR? If yes then how?

If your foreign bank account balance never exceeded $10,000 during 2018, you are not required to file a FBAR.

If you need to file a FBAR, you can file it online here:

https://bsaefiling.fincen.treas.gov/NoRegFBARFiler.html