I am creating a website on wordpress. My website theme is Ultra Lite Blog.

Although I have disabled the breadcrumb but it is still showing. My name also appears under posts heading (such as, POSTED BY:____). How should I remove it?

Secondly, my instagram link shows in the left alignment and not in the center. There is no option to change its position?

Any help would be highly appreciated. Thank you very much!
https://postimg.cc/gallery/HsDdYTL