How to change Bid Button Label
Pro Plugin provides two buttons for bidding:
- Button 1: Directly Bid
 - Button 2: Custom Bid
 
If you wish to change text of any of the two buttons then please add below hook to your active theme's functions.php file.
add_filter('ultimate_woocommerce_auction_bid_button_text',  'your_function_name_here', 10, 2);
function your_function_name_here($button_text, $product)
{
/* to change text of directly bid button */
if (strtolower($button_text) == "directly bid")
{
$new_button_text =  __( 'Directly Bid', 'woo_ua' );
return $new_button_text;
}
/* to change text of custom bid button */
if (strtolower($button_text) == "custom bid"){
$new_button_text =  __( 'Bid Now', 'woo_ua' );
return $new_button_text;
}
return $button_text;
}