Usually, if the betting site offers Skrill as a payment option on their desktop site, you will be able to pay with it on the mobile app. When you go to withdrawing or depositing in the cashier section on the betting app, simply choose Skrill as your preferred method of payment, just as you would if playing on the desktop site. When it comes to processing the payment, you will still be asked to verify it through your Skrill account before the transaction proceeds.