You are welcome.
You can use both of them if you want to.

In case you used the 2nd code, the message on update profile page will be “There was a problem updating some of your profile information. Please try again.” That’s a bit misleading.

Regards
Brajesh

Hi Olandir,
Thank you for the question.
Here is the code to do that

add_action( 'bp_signup_validate', function () {

	$disallowde_names = array( "admin", "me" );

	if ( ! isset( $_POST['field_1'] ) ) {
		return;
	}

	if ( in_array( $_POST['field_1'], $disallowde_names ) ) {
		buddypress()->signup->errors['field_1'] = __( 'Sorry, this name is not allowed!' );
	}

} );

Please update the disallowed list with the names.

Please do understand that it does not prevent the users form changing the name after registration to one of the disallowed ones.

PS:- My colleague @ravisharma proposed another alternative code which works for update as well as registration(Here is his code)

add_filter( 'bp_xprofile_set_field_data_pre_save', function ( $save, $field_args ) {
    $field = $field_args['field'];
    $value = $field_args['value'];

    // Not name field.
    if ( $field->id != 1 ) {
        return $save;
    }

    $restricted_names = array( 'admin', 'moderator' );

    if ( in_array( $value, $restricted_names ) ) {
        $error_message = __( 'Name is restricted. Please try different name' );

        add_action(
            'bp_field_' . $field->id . '_errors',
            function () use ( $error_message ) {
                echo esc_html( $error_message );
            }
        );

        return new WP_Error( $error_message );
    }

    return $save;
},10, 3 );

The problem is it does not show the error to the user.

Regards
Brajesh

Hi Debbie,
I am sorry. That would be 1.4.7 not 1.4.8.

Please try 1.4.7

Regards
Brajesh

1. You have 2 forms on registration as you are using the login form/some filters in the righ sidebar. You can make the registre page single column(Dashboard->Pages->register, edit and set the layout to single column) and only registration form will be visible.

2. It is not possible to change the cover photo of the profile:-
Please share a guest account to test it. Are you getting some error?

3. You can use a plugin to rename wp-login.php to login ro anything. There are many plguins available for the same.
Here are some exmaples.
https://wordpress.org/plugins/wps-hide-login/
https://wordpress.org/plugins/rename-wp-login/

Regards
Brajesh

Thank you Tosin,
We will have a release within next 24 hours with this functionality.

Regards
Brajesh