Unfortunately I am unable to see your website.
Could you please send me a link to the theme you are using and a screenshot with the copyright text?
As a second solution please follow my instructions there in order to replace the copyright text:
You have to add the exact HTML code for that copyright text in Step 1, like in my example below.
You have to go to your website > right click on it and select ‘View page source’ > search there for part of the text you want to remove > once you find it then copy it > and paste it in your dashboard > Tools > Remove footer credit > Step 1 > inside the field for step 2 leave empty to remove it completely.
Wath more videos here: size help