Log in to your tithe.ly account through the portal at wwntbm.com/give. Enter the amount you would like to give each time, the payment method you would like to use, and any notes or memos. You can also choose to cover the fees.
Click the sliding bar to set up automated giving.

You will have the option to give every week, every two weeks, every month, or the 1st and 15th every month. You will then be able to choose what day of the month you would like these donations made.

To complete the donation, click Give.
View this video on recurring giving https://vimeo.com/manage/videos/169140103.