One possibility: go to the website stock.adobe.com and search your asset. When you have found what you were looking for, you hove the mose over the asset and click the "license" button:

Please be aware that this licenses the image and your available credits go down by one! If you first want to test the asset, you can download a watermarked version first:

Regards, Abambo
Hard- and Software Engineer and Photographer.