How to Add Twitter Summary Cards in Blogger (BlogSpot)


I have a Blogger blog. I want to use Twitter summary card with large image thumbnail into my Blogger. Would you please suggest me what to do to change the creator name as per their content as I have multiple author in my blog. I have searched, but could not find. Please help me!!! P.S.: I want to use Large image, not smaller thumbnail image. I have used some codes from somewhere but not a single code proper works for me.