Take it to a pro. This is not a job to goof around with if you want it dead on right
but to answer your question turn it one way to add more toe in to both wheels and the other to take it out. Do them evenly and your steering wheel won't be cockeyed.
If it is just one wheel it is very probable that you have parts that need replacing and are worn out. You can;t have one wheel toe'd in.
jack it up and see what is FUBAR. Upper mounts, tie rod, ball joints, etc.