Proudly presented by Wordpress REMOVE

Hello,
I found text in a header of the page saying "Proudly presented by Wordpress / Theme Sydney by aThemes and there is no way I can get rid of it. Can you help?
Please, see the screenshot.

Hello there,

Normally it shouldn’t been appeared on header area. Please share a link to your site. Probably I could get what’s causing you this issue.

Regards,
Kharis