Click on the name of the board. Scroll down past the iBox, and when the iBox ends and the list of posts begins, there will be a link to the right side titled "Add to Favorites". Click it and you have the board boardmarked...
Or-open up any post on the board. At the bottom, just below the line with links for Public Reply, Private Reply, etc. and above the trailer info that says "Search our boards" will be a dark blue band with a link titled "Add Board Name (symbol) to Favorites"
What is not immediately clear to newcomers on iHub is that Favorites and board marks/person marks are synonymous...
Hope that helps.
News 
Market Data 
Discover 
AI
