When your study is posted, an email will be sent out to a random subset of all eligible participants. Participants can also see currently available studies that they are eligible for, by going to the studies page on Prolific.
We also send email invites to eligible participants for a study every 48 hours, if it has not reached its maximum number of submissions within this time.
Please feel free to advertise your study via other means also (e.g. Twitter, Facebook, & Co). This will certainly accelerate data collection!