help with EMU8086

I need help figuring out how to get this program to display a vertical line is displayed from coordinates (50, 50) - (50, 75) in addition to the horizontal line currently displayed by the program.

I am using the program EMU 8086
I need to know how to do it within the next 2 hours, can anybody help me?

name "mycode"   ; output file name (max 8 chars for DOS compatibility)

org  100h    ; set location counter to 100h

; you may customize this and other start-up templates
; the location of this template is c:\emu8086\inc\0_com_template.txt

; disable blinking (for DOS/BIOS compatibility).
mov ax, 1003h 
mov bx, 0       
int 10h

; this is just a random code
mov ax, 1234h      ; load ax with hexadecimal value.
mov dx, 0x1234     ; 0x is a valid hexadecimal prefix too.
mov ax, 1234       ; load ax with 04D2h = decimal 1234 = 10011010010b.
mov ax, 0ABCDh     ; must have 0 prefix if first digit is A,B,C,D,E or F
mov dx, 0xABCD     ;                                      or use 0x prefix.
mov dl, TeSt1      ; the integrated 8086 assembler is not case sensitive, test1=TeSt1, AX=ax, etc...
jmp n              ; jump over 1 byte to skip over the test1 variable.
test1 db 20h       ; 1 byte variable 20h = 32.
n:
add dl, dl         ; dl = dl+dl = 20h+20h = 40h = 64 = 01000000b
inc dl             ; dl = dl+1 = 41h = 65 = 'A' (ascii code)
mov ah, 2          ; ah and dl are parameters for int 21h
int 21h            ; print 'A'.
mov dl, 1          ; ascii code 1 is a funny face.
int 21h            ; print it.
mov al, 11100101b  ; b suffix is for binary. 11100101b = 0xE5 = 229
xor al, 1111_1110b ; _ can separate nibbles.

; video.asm
; uses interrupts to set video mode and draw a line

include 'emu8086.inc'

org  100h ; set location counter to 100h

jmp CodeStart

DataStart:
    xStart dw 50        ; x coordinate of line start
    yStart dw 50        ; y coordinate of line start
    length dw 25        ; length of line

CodeStart:

    ; set the video mode 320x200, 256 colors
    mov al, 13h
    mov ah, 0
    int 10h

    ; initialize cx (x coord) to xStart + length
    mov cx, xStart
    add cx, length
   
    ; loop from (xStart+length) to xStart to draw a horizontal line
    LoopStart:   

        ; draw a pixel
        ; set color in al, x in cx, y in dx
        mov al, 50
        mov dx, yStart
       
        ; set sub function value in ah to draw a pixel
        ; and invoke the interrupt
        mov ah, 0ch
        int 10h
       
        ; decrement the x coord
        sub cx, 1
       
        ; test to see if x coord has reached start value
        cmp cx, xStart
   
    ; continue loop if cx >= xStart
    jae LoopStart
   
    ret

mov dx, 0705h      ; print message using BIOS function at 7,5
mov bx, 0          ; page 0.
mov bl, 10011111b  ; white on blue.
mov cx, msg_size   ; number of characters to print.
mov al, 01b        ; update cursor only.
mov bp, offset msg
mov ah, 13h        ; BIOS function for print.
int 10h            ; print message at es:bp.

mov ah, 0          ; wait for any key....
int 10110b         ; same as int 16h or int 22.

ret   ; return to the operating system.

msg         db "press any key..."
msg_size =  $ - offset msg

CFLAGS JUST KICKED IN!