Can’t remove/edit footer wordings

Hi,
I went to the file manager folder and wanted to edit the footer.php file of the renden business theme but it doesn’t show the words that are appearing on my site (themed by think up themes Ltd and powered by WordPress) in the footer.php file for me to remove or edit. I’ve tried many other ways such as directly from the WordPress admin control, file manager and used FileZilla but none of it worked. Could anyone please help me? Thank you

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