Adobe stock is free for one month. Thereafter, you have a one-year subscription (well 11 months as the first month was free). Do not forget to cancel at the end of your trial, if you do not need the service!
On https://stock.adobe.com, when you have found the asset, you want to license, you will need to push the "License"-Button.
If you expand the image, you have the same options, but get additional information:
ABAMBO | Hard- and Software Engineer | Photographer