NOTE: You will need global administrator credentials to enable editable grids.
1.) Start from a list view for the entity you want to enable editable grids in.
In my example, I am enabling editable grids for Opportunities, so I am starting from Sales > Opportunities > My Open Opportunities.
2.) Click on […] More Commands > Customize Entity.
3.) Click on the Controls tab.
4.) Choose Add Control.
5.) Highlight Editable Grid and click Add.
You should now see both Read-only Grid and Editable Grid under Control, with radio buttons for three interfaces: Web, Phone, and Tablet.
6.) Choose which interfaces you want to use read-only grids, and which interfaces you want to use editable grids.
Now in this example, I want to use editable grids just for the web interface, but you can also do it for the phone and the tablet interface as well.
7.) Click Save, then Publish.
Once the changes have been published, you can leave this screen.
Once you refresh the opportunities screen, you can see that all the highlighted links are gone. Now you can actually go in and change the details of each record on the fly.