Starting a CE 7.1 Process from Portal (Not from NWA)

Hi,

I have developed a Process using process composer in NWDS CE 7.1 EhP1.

I used to initiate the process from NWA Process Repository.

But now I want to instantiate this process from a particular useru2019s portal page. Something we used to do in Guided Procedures.

Any idea how to go about it?

Thanks and regards,

Amey Mogare