How to override the standard detail page button through custom VF page in salesforce?

Hi Himanshu,

Suppose you want to override standard 'New' button with custom visualforce page on opportunity just follow below steps:

Step-1: Search Opportunity in the quick search box.

Step-2: Then click "Create a new custom link" from the appeared options.

Step-3: Click on "Edit" which is next to "New" button.

Step-4: Select radio button next to Visualforce page from "Override With" and select your page.

Thanks