how to change sidebar settings?

Hi guys,

I am sure this is an easy fix but i cant find the answer anywhere. On my website https://startforart.com my social counter is working fine on the home page, but when i click on an article the sidebar to the right has an error with the instagram counter. I inspected the element and i noticed i put the username as thestartforart# instead of thestartforart. but how can i change this?

Thanks

Open the post/page then on the admin bar, click on customise>widgets. Select the sidebar name>social counter and edit from there.