Add a Conga Composer Button to a Page Layout Manually in Lightning

Add a button to a page layout to make it available for end users to launch the solution.

To add a Composer button or link to a page layout in the Lighting UI

1. Navigate to Setup → Objects and Fields → Object Manager → [Object] → Page Layouts and select the page layout. The Page Layout Properties screen appears.
2. Click Mobile & Lightning Actions or Custom Links.
3. Drag and drop your new button to the Salesforce Mobile and Lightning Experience Actions area on the page layout.
4. Click Save.