Add a button to a related list in CRM

Add a button to a related list in CRM

There is an existing relationship between Deals and Quotes that is built into zoho crm. We have made a button in sigma that will create a sales order and launch the associated creator app with the id of the new sales order. This is visible from the Quote View. However, I can't see how to do the same for the Quotes related list in Deals.

The same question for looking at the quotes related list on an account. It's possible to add a button in CRM to this related list, but not through sigma.

How do I do this?