billynair on "Remove credits in theme sixteen"

You will want to check the license to use the theme, it might require you to leave it there. If not, then read on:

Some themes give you instructions on where to change the "Theme By" variable, which is %1$s in your code. The theme I used is designed to be modified using the GNU license and listed the various places to change the information.

You can change this line:

<?php printf( __( 'Sixteen Theme by %1$s', 'sixteen' ), 'InkHive' ); ?>

to read

<?php printf( __( 'RocksAndBubbles Theme by RocksAndBubbles', 'rocksandbubbles' ), 'InkHive' ); ?>

BUT, like I said, make sure you are not violating any license agreement, if so, it is better to go find another theme that allows you to do what ever you want to it.