If you created the mashup in the dev-hub of your QS Enterprise environment then it's already hosted on that machine and accessible in the dev-hub. If you developed it on another machine you need to go to the extensions folder on that machine and zip the folder with your mashup files. Then you import that mashup zip file in the QMC of your QS Enterprise environment as an extension. After that you should be able to find it in the dev-hub.
@Gysbert_Wassenaar I think i have not put my question properly. I'll rephrase it better. What i want to know is I have two qlik sense application app1 and app2. I have made a mashup with objects from both the apps. If I want use the mashup in a website say for example: www.salescontent.com, a public accessible website. So in that case will my mashup get rendered.
If you create the mashup on the dev-hub then you can click the view button at the bottom to see the mashup as a webpage. In the addess bar of you browser you can see the url for that mashup. You include that url in an iframe in your website page.