How do I remove or resize the border of the feature pictures? the other is about share box?

As link: I have 2 questions.
1.How do I remove the 'TWEET" &"PINTEREST" ,just keep "FB" and I WANT to add a social media "line"
Where do I FIND the option to change?

2.How do I remove or resize the border of  the feature pictures in Blog? 
I  USE 450x300 pixels but not fit. what is the exact size can fit the frame ?
or How do I remove or resize the border of  the feature pictures?

I'm so appreciate your support. Thanks a lot.   


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