Hi,
Could you be more precise, on which page ? A product page to go back to a product listing page ? Or something else ?
To have a back button, you can use this kind of button (you can find this kind of code on google ):
<input type="button" value="Back" onClick="history.go(-1); return true;">
For the next, just use:
<input type="button" value="Back" onClick="history.go(1); return true;">
Place this code in the desired view, for product page the view is "product / show", product listing "product / listing".
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