picture is not displayed

I installed Custom field. but the picture is not showing

https://prntscr.com/i3QA3nUxtdjJ

https://prnt.sc/gPX6hFq1-157

I want more size pictures and square ones.

in the media plugin and the next huge 1536×1536.
how to make 150×150 or 160×160?

site https://www.anilatur.com/ekskursii/ekskursiya-bari/