Inline list editing enables you to update records quickly by changing data directly in a record’s row on the list page. This capability supports faster and easier editing because you do not have to go into each individual record to edit it. Addresses cannot be edited on list pages using inline editing.
Inline list editing is available when the Inline Editing feature is enabled. To enable the feature, go to Setup > Company > Enable Features. On the Company subtab in the Data Management section, check the Inline Editing box and click Save.
To Use Inline Editing:
Use the Edit switch at the top of the page to turn on inline editing. When editing is off, the switch displays an x.

Click the field where you want to enter or change information.

Click away from the field to save your changes.
The data is automatically saved on that record.