Descent: 3/5 and the up arrow mean that your baby is 3/5's above the brim of your pelvis, so not engaged. ROP means Right Occiput Posterior, meaning that your baby is positioned with its back slightly to the right of your spine, so not fully posterior (which is OP) not sure what the 6 means though.

ETA - forgot to add that none of this is cause for worry - baby will engage sooner or later and it can change position too before the birth.