HTML ads not showing up

Hello. Firstly its a beautiful theme. I love it very much. I started my blg with this theme and was trying to put html ad in the sidebar using text Widget.But it failed to display the image banner. I used banners of various size but no use. Can you please help?

Hi,

Can you please share your page link so we can inspect that, and also it would be good to post code for that ad.

Best Regards