1. On Blogger Dashbord Click Template.

2. Click Edit HTML

3. Scroll down and Find this Code:

4. Change Facebook App ID here with yours

Change Facebook Admin ID here with yours.

5. Change @username with yours twitter ID/Website twitter ID and change @username with yours twitter ID too.

Note: Before your cards show on Twitter, you must first have your domain approved. Fortunately, it's a super-easy process. After you implement your cards, simply enter your sample URL into the validation tool. After checking your markup, select the "Submit for Approval" button. Go Here : Validator Twitter for testing and approval