Right-clicking on a concept in the Search View brings up the Context Menu, where you can select Add Bookmark(s).
Bookmarking from the Search View
Bookmarking in the Concept Editor
Concepts can be bookmarked directly in the editor by clicking the Add bookmark icon in the upper right corner of the editor.
Bookmarking from the Concept Editor
Bookmarking in the Concept Navigators
Right-clicking a component of a terminology view reveals the Context Menu with the Add bookmark action.
Bookmarking from the SNOMED CT View
Description
When adding a bookmark, you can specify a short description for the bookmark, which will be displayed in the Bookmarks View along with the bookmarked component.