@marinabfs on the website, you can just click on #26204, but if you are on the app (I don't use the app, so I am not entirely sure), you probably go to "patterns" like you would on the website and then enter the number in "pattern#".
The "chain" in this one is a lot like making a single-color teardrop loop at the top of each heart. The video tutorial by @pattncraft called Continuous Teardrop Loop on #26204 was really helpful for me 😊