BP6 and BP7 where is in hardware

hi i am using portb for lcd 8 bit i need how connect hardware i cant find the BP6 and BP7 ?? or can any help me convert my code to 4 bit LCD

void lcd_init() // fuction for LCD initialization
{
lcdcmd(0x38);
lcdcmd(0x0C);
lcdcmd(0x01);
lcdcmd(0x06);
lcdcmd(0x80);
}

void lcdcmd(unsigned char cmd)
{
lcd=cmd;
PORTD=(0<<rs)|(0<<rw)|(1<<en);
_delay_ms(50);
PORTD=(0<<rs)|(0<<rw)|(0<<en);

}

void lcddata(unsigned char data)
{
lcd=data;
PORTD=(1<<rs)|(0<<rw)|(1<<en);
_delay_ms(50);
PORTD=(1<<rs)|(0<<rw)|(0<<en);
}

void lcdcmd1(unsigned char cmd)
{
lcd=cmd;
PORTD=(0<<rs)|(0<<rw)|(1<<en);
_delay_ms(5);
PORTD=(0<<rs)|(0<<rw)|(0<<en);

}

void lcddata1(unsigned char data)
{
lcd=data;
PORTD=(1<<rs)|(0<<rw)|(1<<en);
_delay_ms(5);
PORTD=(1<<rs)|(0<<rw)|(0<<en);
}
void lcdstring (char *string)
{
lcdcmd(0x0C);
while (*string)
lcddata(*string++);
}

PB6 & PB7 are used as the XTAL pins on '328 boards.
You have reprogram the fuses if you want to use them as IO pins.

ok thanks but can u tell me how defant portb with 6 pins for lcd ??

What kind of display?
Something like one of these?
http://www.newhavendisplay.com/lcd-character-c-2.html
There are several LCD libraries available:
http://playground.arduino.cc//Main/LibraryList#ColorLCD