This issue's on my mind for a while now. I need to voice out.
IMHO, if you are interested in any job, I feel that you should approach the potential employer instead of the other way round.
I've seen job seeker's replies in employer's thread:
|I want the job. Please email me at firstname.lastname@example.org|
|Can PM me more details?|
But of course, in any point of time you feel that the information posted by a potential employer is not clear, feel free to reply in the thread with your query. I believe they will be willing to react to the reply accordingly.