Adding info in Checkout pages

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I have searched and found some answers to this question however have not managed to understand completely how one can include information during the checkout process.



I need to be able to provide some instruction at each stage of the checkout ie, on each page “which” button to click once they have checked infor.



I would like to include instruction within the “Payment Method” box to outline the payment process (rather than have the checkboxes etc.



If anyone can guide me to the right .tpl and/or other documents and explain where I can input additional information it would be most appreciated.



Cheers