ANSWER:

You either put the right hand on the left hand or hold the left wrist with the right hand. 

when i put my hands on my chest i heard a reliable shaykh say the fingers should be tight, shaykh does this include the thumbs? cause when i put my hands on my chest my thumbs even when putting four fingers tight my thumbs stick out a little and its irratating sticking my thumb to the palm? can i make the other four fingers tight and thumb leave it in natural way? what should i do?