how do i accept a lower amount on a listing

[sherrielinda]

someone has offered me a lower price than my buy it now price, how do i accept and get paid for it, thanks

[funkyliz56]

Easiest way is to reply to their eBay message using the 'reply with offer' option.  The offer will remain valid for 48 hours and can only be seen by the person making you the offer.

[sherrielinda]

ok, when I go to the message that was sent I know about the reply button but don't see one with "reply to offer"
When I also try and revise listing where it says "make offer" it stays the same and won't allow me to change it.
I'm either being really thick or just don't get it.
Also I've tried the accept offers of etc and it just comes back telling there's a problem, sorry everyone but can't do it.
Any other suggestions what I'm doing wrong. Thanks for trying with me, very grateful