Need help pulling DX out of the stack and putting the value on a 32 bit OFFSET of a signed DWORD

Question

Hi everyone I am new to x86 architecture for assembly as well as working on the stack. What I want to do is add the two operand word values together to get 26 and to change the dest dword into this. I am not too comfortable with working with the stack so my work is a bit of a jumble.My assignment does not allow global variables hence the pushing of both operands. What I had tried to do was dereference both operands and put them onto dx for later. I wanted to in the second procedure get dx wherever it is on the stack and movsx it to the eax(which should go to dest) but neither my dest or operands will show the correct value and will crash the program. Right now I am using dx directly but need it on stack instead.

.data
operand1   WORD    46
operand2   WORD    -20
dest       DWORD   0

.code

main PROC

    push   operand1                            ;14
    push   operand2                            ;12
    push   OFFSET dest                         ;8
    call   compute

exit
main ENDP

;-------------------------------------------------------------------------
;Compute
;-------------------------------------------------------------------------
compute PROC

    mov dx, [ebp + 12]
    add dx, [ebp + 14]
    push dx
    mov eax, [ebp + 8]
    call decoy

     ret
compute ENDP

;-------------------------------------------------------------------------
;Decoy
;-------------------------------------------------------------------------


decoy PROC
    push ebp
    mov ebp,esp

                                                            ;[] dereference
    mov eax,[ebp + 6]                                          ;contains OFFSET
    mov [ebx], eax    
    mov esp,ebp

    ;;Find DX on register and mov that onto eax

    movsx eax, dx




    call   WriteInt
   
   pop ebp
    
decoy ENDP