If the Enable button setting is turned on for an offer, the Make an Offer app will automatically place the button near the Add to Cart button on your product page. You can also control exactly where the button appears by adding an app block to your theme.
In your Shopify admin, go to Online Store > Themes.
Find the theme you want to edit and click Customize.
Open the drop-down menu at the top of the page.
Select Products, then choose the product template you want to edit.
In the side panel, click + Add block or + Add section, depending on where you want the Make an Offer button to appear.
Under the APPS section, click Make an Offer Button to add the block.
Click Save to activate it.