Using Seesaw's Link option does not work well for sharing the Student Link. If you share it this way, Seesaw will create an unhelpful image that looks like an error on the games website. Rather than using Seesaw's Link option, a better way to share the Student Link is to click on the Add button and then choose Assign Activity. Then choose Create New Activity, give it a name like Games to Play, and then paste the link in the Student Instructions box. Then the link will show up for the student but Seesaw won't create that unhelpful picture.
If you would like to add a picture of the games website, you can save the image below to your computer and then upload it to the activity by choosing Add Multimedia Instructions or Example and then choosing Upload.