You are almost there! If you are ordering from a mobile device then tap on "Red circle with cart icon" at the bottom of the screen to see both cart & place order option. On bigger screen, cart and place order button on the right-hand side.
There is an instruction box below the cart. Add your instruction / message there. We will pass it on :)
Sorry! our system does not allow you to place order without registration. Registration is easy and it will save you time in the future for faster checkout.
If you've selected card payment option then you will see payment option in the next step.