Hi @Theeradache.
Apologies, but I'm still not clear on the question. Are you asking how to access the mashup from a public location? If so, does your ThingWorx site have public access? If not, you would need to set that up first. It would most likely require that you work with your Networking team to configure it per your company's policy.
Once you do that, you can access the mashup from any browser by entering the url you see when you view the Mashup from the Mashup builder. For example: the url should look something like this: https://<domain_name>/Thingworx/Runtime/index.html#mashup=HelloWorldPlayground
Please let me know if this fails to answer your question.
Regards.
--Sharon