You will actually need to apply border radius on the wrappers as well. Try this,

P/S: Please take note that our support does not cover customizations

i want not many cover customization, i want only the right avatar. I had search where i can edit. but i do not no know about less and i find not the right css.
and the next problem is i can only override the .php files but not css. and if the next update comes then i lose all editing in the css files in the core.

I am also willing to pay something for it.

on the picture is what i want.

You do not need to modify the less / css files in EasySocial. If you are proficient in css, you can apply the css codes into your Joomla template's custom css file without hacking any of the files in EasySocial.

If you want us to customize this for you, you can always reach us at https://crm.stackideas.com/