To obtain Invocation of the Heart (AKA Zikr-e-Qalb/Qalb-e-Saleem/Simran), simply look at this image of HSE Ra Riaz Gohar Shahi and say the name of God you prefer three times (i.e. Allah, Ra Raam, Ra Riaz). If you wish to take the name of Jesus, say "Ya Isa" which is His name before translation, and is therefore the most effective.
After that, if you don't feel the name of God resonating in your heartbeats, ask His Sublime Eminence for help and you shall be helped.
In addition, you can ask this image any question, and you shall hear the reply in your heart. This image speaks all languages.