the new platform has no bookmark feature and it was communicated that the internal bookmarks of the old platform won't be migrated. This is the relevant part for you:
"Internal bookmarking: You won’t be able to bookmark content within the new community, and any internal SCN bookmarks won’t be migrated. If you’d like to continue bookmarking SCN content, please do so with your browser manually. SCN URLs should redirect to the new location of the content."
There is an idea created to bring the feature back. So if you want to show your support for it, just vote it up.
PS: I re-tagged your question to "Using SAP.com", because that is the tag for all bug reports and support questions concerning this platform.
I suggest you read through the information available under "Community > About the Community" (in the header), that should help you get started with the new platform. 🙂
That was a really good feature... I had so many book marks and now it is all gone... I still love the first SDN site.. it was the best, next came the SCN which was just OK compared to the predcessor.. now what will do with the UI when you remove all functionality... in the name of UI all the good functionality getting stripped and navigation becoming extremely difficult every time the site is change. yes we are progressing..what a irony. Hope they have NOT remove export to PDF option, then it is better to shut this site down.