If you are using Swag Codes Spoiler to get almost daily notices of Swag Codes, (sign up at its notifications page), do not believe it when they tell you the code has expired. Often they will give you the Swagbucks anyway, either because you qualify for a code extension, or for no apparent reason at all.

To enter the code, hover on the number of points you have shown on the upper right corner of the Swagbucks home page and then click on Redeem Swag Code