LITE-ON LDW-851S Help Please

i dont seem to be able to write DVD-, it will only let me write DVD+.

i am sure i should be able to write using both mediums.

do i need to change any settings, if so what?

help me please, its doing my head in

We need way more details.
What media are you using? You system specs? What do you mean by “can’t burn”? Any error messages? Software using?