How do we get our ladies to use the nesting boxes

[Beau plus Bunny]

Our chickens are 20 weeks old and lwyed their first eggs around 17 weeks currently we only 4 hens actually laying
But how do we get them to use the nesting boxes we were thinking about getting some ladders for them would that help or no

 

[nuthatched]

Can they fly?
If not,make ground level nesting boxes

 

[Pearlescent]

You can put fake eggs in the boxes to encourage them to lay there. Worked for mine.

 

[BigBlueHen53]

I think your openings are too small. Open them up, put straw in them and some golf balls and I'll bet they'll start laying in them in no time. Leave about a 2" lip so the straw stays in.