In addition to the info from Steve, here I have some modifications for you.

Check and come back for the parts you do not understand.

Code:
EEPROM 1,[1,2,3,4,5,6,7,8,9,10,101,102,103,104,105,106,107,108,109,110]
'Keep this command at the first line.
'this will run only one time during the programming.
'not each time you power your PIC.
'These are your initial default values.


Increase_OnTime_Push_Button     VAR PORTD.2 '(pin 21)  2nd  
Decrease_OnTime_Push_Button     VAR PORTB.0 '(pin 33)  3rd  
Increase_OffTime_Push_Button    VAR PORTB.1 '(pin 34)  4th                 
Decrease_OffTime_Push_Button    VAR PORTB.2 '(pin 20)  5th  
Change_On_Off_Time_Push_Button  VAR PORTD.1 '(pin 35)  6th  
Led                             VAR PORTA.1 '(pin 3)
Buzzer                          VAR PORTC.2 '(pin 17)
IncrFlag VAR BIT
DecrFlag VAR BIT

OnTime  VAR byte
OffTime VAR byte
Index   VAR byte
Hour    VAR byte
HOUR = 0

Is_Pressed      CON 0
Is_Not_Pressed  CON 1
      
IncrFlag = 0 '0 =  button is NOT pressed. 1= button is pressed.
DecrFlag = 0 


GOTO MainLoop

Change_On_Off_Time:
    WHILE Change_On_Off_Time_Push_Button = Is_Pressed : GOSUB buzz : WEND
Loop:

    IF Increase_OnTime_Push_Button = Is_Pressed THEN 
       WHILE Increase_OnTime_Push_Button = Is_Pressed : GOSUB buzz : WEND
       IncrFlag = 1
       OnTime = OnTime + 1
    ENDIF

    IF Decrease_OnTime_Push_Button = Is_Pressed THEN
       WHILE Decrease_OnTime_Push_Button = Is_Pressed : GOSUB buzz : WEND
       IncrFlag = 1
       OnTime = OnTime - 1 
    ENDIF
                                   
    IF Increase_OffTime_Push_Button = Is_Pressed THEN
       WHILE Increase_OffTime_Push_Button = Is_Pressed : GOSUB buzz : WEND
       DecrFlag = 1
       OffTime = OffTime + 1 
    ENDIF

    IF Decrease_OffTime_Push_Button = Is_Pressed THEN
       WHILE decrease_OffTime_Push_Button = Is_Pressed : GOSUB buzz : WEND
       DecrFlag = 1
       OffTime = OffTime - 1 
    ENDIF

    IF Change_On_Off_Time_Push_Button = Is_Pressed THEN
      WHILE Change_On_Off_Time_Push_Button = Is_Pressed : GOSUB buzz : WEND
      IF IncrFlag THEN WRITE 1,  OnTime       'If zero, then it means OnTime never changed.
      IF DecrFlag THEN WRITE 101,OffTime    'If zero, then it means OffTime never changed.
      gosub buzz  ''''
      pause 100   'kind a confirmation sound.
      gosub buzz  ''''
      GOTO MainLoop
    ENDIF

    LCDOUT $fe,1,   "OnTime  = ",dec Ontime
    LCDOUT $fe, $c0,"OffTime = ",dec OffTime 
    PAUSE 10

GOTO Loop


MainLoop:
    IF Change_On_Off_Time_Push_Button = Is_Pressed THEN goto Change_On_Off_Time

   'Hour variable gets its value here......
    IF Increase_OnTime_Push_Button = Is_Pressed THEN 
       WHILE Increase_OnTime_Push_Button = Is_Pressed : GOSUB buzz : WEND
       Hour = Hour + 1
    ENDIF

   'Hour variable gets its value here......
    IF Decrease_OnTime_Push_Button = Is_Pressed THEN
       WHILE Decrease_OnTime_Push_Button = Is_Pressed  : GOSUB buzz : WEND
       Hour = Hour - 1 
    ENDIF


    FOR Index = 1 to 10
        READ Index , OnTime            ' Read stored ON  time.
        READ Index +100, OffTime       ' Read stored OFF time.
        IF Hour = Ontime  THEN Led = 1 ' If yes, turn ON the relay.
        IF Hour = Offtime THEN Led = 0 ' If yes, turn OFF the relay.
    NEXT Index 



    LCDOUT $fe,1,   "Hr=",dec Hour," OnTime=",DEC Ontime
    LCDOUT $fe, $c0,"OffTime = ",DEC OffTime

    PAUSE 100
    

GOTO MainLoop     


Buzz:
     PWM Buzzer,250,1
     RETURN

END