Here are 3 easy ways to navigate the site.

Starting on the left, hover your mouse over "sportschatter" in the title bar (arrow #1) All the Forums will appear. Then if you hover over a Forum (the Baseball Forum in this example) the sub boards appear. Just click on the forum or board you want to go to..

Or use the "recent posts" tab to see the newest posts. For some mobile users this tab is at the bottom...

or use the "participated" tab to see the threads you have posted in...