A83: inc (HL) on the TI83

Can anybody help me with this problem: (I think the solution is easy)

I have written this piece of code:

ld a,(address)

inc a

ld (address),a

I tried replacing it with:

ld hl,address

inc (hl)

But it does not seem to work properly. What am I doing wrong?

Yours sincerely,

Frank Schoep