Using an Entry's Added Form in a template in Sprout Forms
To dynamically display a Form that you've related to an Entry using a Sprout Forms Form relations field you can pass the handle of the form to the displayForm() tag in your template:

_entry.html

{% set formHandle = entry.formFieldHandle.first().handle %}

{{ craft.sproutForms.displayForm( formHandle ) }}


There is a doc page that describes this here: Relations Field on Entry Page and depending on where you want to redirect the user after they submit the form, Sprout Forms also supports relative redirects.