download button changed to link to

Ok, so i downloaded installed the discover theme. I want the orange download button to link somewhere else. and i cant figure out where to put in the actual address of the page i want to link it to.

<?php if(of_get_option(‘wel_button’) != “off”) { ?>

<?php if(esc_html(of_get_option(‘welcome_button’)) != NULL){ ?>
“><?php echo esc_html(of_get_option(‘welcome_button’)); ?>
<?php } else { ?> “> <?php echo “Service Request Form” ?> <?php } ?>

<?php } ?>

where in this jumble of stuff do i change the link to go to another page? i figured NULL meant it would just do nothing? and stay on current page. do i change it from null?