There are a few sorting options.
All new posts from the perspective of the member are show with a "New " sign beside it.
You will notice that the posts appear in the index in order of most recent to the oldest, in terms of activity.
You will also notice two other sorting options at the top left of all the forum pages, beside your name.
Does this help? There are other hidden sorting options that I can make availiable if you need them ( I dont use these features myself)
Oh I nearly 4got, while in any of the forum indexs you cxan press F5 on your keyboard to refresh your page.