You may disperse camp on Forest Service lands that do not have closures or restrictions. Dispersed camping is not allowed in developed recreation areas like campgrounds, picnic areas, or trailheads. Drive on existing roads and, when car-camping, keep your campsite within 150 feet of a road.
If you can, pick a site that has been used before to minimize your impact in the forest. If there is no existing campsite where you are going, then follow Leave No Trace guidelines:
Camp on bare soil, if possible, to avoid damaging plants.
Do not camp within 200 feet of any water source.
Avoid camping in the middle of a clearing or meadow; keep your campsite less visible so that other visitors can enjoy the views.
Do not try to level or dig trenches in the ground at your campsite. Pick a tent site that is already level with good drainage.