A beginner with 2 georgous Buff orpingtons who won't roost!!

We had delivery of our two Buff Orpington's last week (Gregory and Hilary) he's being a pain as he won't use the ramp to go in or come out. I've since read that this breed isn't too keen on ramps so we're looking to change the house, we've tried forcing him down but he's having none of it!. Hilary seems to be fine with it but won't go in at dusk because he won't. I've also noticed that they're not roosting, they're sleeping on the floor of the house. It's raised on legs to allow a bigger run space when they're not roaming. Is this detrimental to them and if so how do I get them to roost?

Any advice greatly appreciated.

I have a buff orp... and she is huge...

She happily goes up and down a ramp too,  however if the birds are young some of them  take a while before the seem to get the hang of it.   As for the roosting problem, you can try picking them up and placing them of the perch (basically showing them what to do), or I've found if you give them a couple of weeks to get used to it - they will start to roost of their own accord.   When  I used to buy  young birds (I hatch my own now and its great, much more fun)  I have shut them in the coop for a few hours so they realise its home and then just opended the pop hole eventually they will come out.

for buffs being small .... please read .. bantam ,, im not to well in the thinking stages thei week . :cry: