1) Do you have whatever you wish to draw selected? Line, point, circle, curve, etc..., whatever it may be? If so, then in the coordinate box just type you're coord, x1y2 or whatever you prefer. There doesnt need to be any commas.
2) Dolphin partmaster is not a solid modeling software. You can however select an iso view which I prefer to use mostly.
Once you get the basics down, it's actually very easy and something that will become a sinch to use whenever you do.