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I want to display custom text instead of website url. I tried to change the settings in admin page, but it doesn't work, the website url still appearing

Hello everyone, As i said, I need help to change my website title. I use a wordpress and I have very few notions of php. I want to change the title of my website, because only the url appears. Here is my code, I believe that I have to change something here but i don't know where : <?php if( bi_get_data('custom_logo') !== '' ) { ?> <div id="logo"><a href="<?php echo home_url(); ?>/" rel="home"> <img src="<?php echo bi_get_data('custom_logo'); ?>" alt="<?php bloginfo( 'name' ) ?>" /> </a></div> <?php } else { ?> <?php if (is_front_page()) { ?> <a class="navbar-brand" href="<?php bloginfo( 'url' ) ?>/" title="<?php bloginfo( 'name' ) ?>" rel="homepage"><b><?php bloginfo( 'name' ) ?></b></a> <?php } else { ?> <a class="navbar-brand" href="<?php bloginfo( 'url' ) ?>/" title="<?php bloginfo( 'name' ) ?>" rel="homepage"><b><?php bloginfo( 'name' ) ?></b></a> <?php } } ?> </div> Thanks for your help.