For example this is the link to the General Warriors Discussion :
Once you are inside the forum, there is a button on the right hand side at the top that says "Post New Thread"
Click on that.
To find a post you have previously bookmarked, goto your account, and they will all be presented to you under "Your Bookmarks".
Good usage of bookmarks are your tips at the start of the year for example.
1) They will not know that you are blocking their posts
2) Their posts will not be shown to you. You are however able to view 'ignored' posts if you choose to.
This functionality is pretty useful if you find some posters to be annoying, or simply not bringing much value to the forums especially if you are time poor.
To ignore someone, simply hover over your username, and then click on 'People you Ignore'
You will be presented with a page to enter in the username you choose to ignore, and then save the changes.
Thats it! The person's forum posts will now be shown to you.