How can I find out someone's contact info on Craigslist?

[Scootahs]

I found a Diamondback BMX Bike and I want the bike but the owner does not have any contact info. No Email, No Number, No Location. (God I hate people who do that) Thanks for reading.
@recycling is gay, throw it away I know, It's a Diamondback 2012 Venom BMX Bike. What a steal at $100

[Arin]

they should have a craigslist email. there should be an option somewhere near the top where it says reply, click that and choose which email you would like to use