The statements and Reasons correspond to each other by the numbers listed.
Let C = congruent in place of the congruent symbol. I don't have it on my keyboard.
Statements
1. Side MN C Side ON.
2. LN is C to LN.
3. Angle LNM is C to angle ONL
4. Angle NML is C to angle NOL
5. ML is C to OL
Reasons
1. Given
2. Reflexive Property
3. Definition of angle bisector
4. SAS Postulate
5. Side NL cuts MO in half