On some of the OceanWP demo themes, even the pro ones there may be dead links to spammy sites. To get rid of the credits link…
Go to WordPress’ Appearance > Menus and look for Footer Menu. Delete the credits link or add your own links. If you do not want to display the menu at all you can uncheck Footer in Menu Settings/Display Location.
Alternatively, in the OceanWP Customizer/Menu just turn off Footer checkbox.
PS. If you are trying to center the footer copyright across the whole width of the page, displaying the footer menu will not allow you to do that. To center the copyright menu switch off the footer menu.