Either way, judging by the number of sites offering opploans sign in payday loans that have come up in the past years, we can conclude that payday loans are here to stay. How to apply for payday cash advance loansLog in to a preferred payday loan site and fill out the form provided. Here you will only need to fill in your personal details. Once you submit the form, the personnel will go through your detail to confirm that you are indeed credible after which they will deposit the amount in your account. This may take 18 hours to 24 hours. The maximum amount that you can loan varies from one organization to the other.