I'm not sure about the nature of you question. Firstly if you mean, position the comb (with the adjusting lever on your clipper because your blades wont work, then:)
If you move the comb downwards using the lever on the side of your clipper you will get a shorter cut, if you move it forward you will get a slightly longer cut. If your clipper makes a horrible noise, I believe there is a plastic adjuster on the side that you adjust with a flat head screwdriver. This adjusts the springs inside the clipper which effects how central the cutter moves from side to side. Adjust this while the clipper is running. You want your blades to be as central as posssible. If they still do not work, you may need your blades sharpened. This costs £5.90 incl. VAT & Postage www.sheareaseltd.com
You could send your clipper to them as well and ask them to re align your blades after sharpening and they'll just charge the extra postage. (extra £5)
Hope this helps!
If you mean how to hold the clipper with the blade relative to what you are clipping. You need to hold the clipper so the teeth are not pointing into your project, but not pointing away from it either. Keep the comb parallel to your project. With human hair, cut against the grain, with an animal cut with the grain!
Hope This Helps!