Firstly, make sure that indeed your referrals appear on your referral list.
If you still do not receive any referral bonus, it is possible that your referrals are not sharing their internet bandwidth with Honeygain and do not have the Honeygain application installed and open and/or are not sharing their internet bandwidth.
To check if that is the case, open Dashboard and choose the Transactions history view on the left. You will be able to see all credit transactions that are happening on your account. There you could see how much referral bonus you had gained for the previous day.