The note on the second fret of the fifth string is a B note. Use the second finger of your left hand to fret this note. This B note is written under the first ledger line below the staff.
Special attention should be given to the left hand fingering in bar numbers 5 and 6. It is important to hold the B note on the last beat of bar 5 for the entire duration of bar 6. You will therefore need to use the 4th finger of your left hand to finger the G note in bar 6.