To create a Donate Now button in MyGiving to enable credit/debit card donations you will firstly need to create a Braintree account which will process the donations for you – similar to JustGiving or Paypal but with the money going directly to your church/charity bank account.
For guidance on how to add a donation button to your website click here
For advice on how to add a donation button to your ‘A Church Near You’ page click here