1. From the management settings for the field’s object, go to Fields.
2. Click Edit next to the field’s name.
3. Modify the fieldattributes. The attributes differ depending on the field type. If you’re editing a picklist, you can change its definition and its values. For picklist settings, see Add or Edit Picklist Values.To change the type of this custom field, seeChange the Custom Field Type.
4. Optionally, define custom help text for the field.
5. For lookup and master-detail relationship fields, optionally define a lookup filter.
6. For formula fields, click Next to modify the formula.
7. In Enterprise, Unlimited, Performance, and Developer Editions, click Next to set the field-level security for the field.