Sorry, I'm in my own little world here.
If you look across the top of the screen on your browser (IE or Netscape), you should see a row of buttons <Back>, <Forward>, etc.
If you don't, maybe they've been shut off. To find that toolbar in Netscape, at the very top click: View=>show=>navigation toolbar. In IE it can be found at View=>toolbar=>standard buttons.
Then, you can click <Back> to return you to the previous page you visited. After I post here, I will be sent to a page which redirects me to my new post at the board. To get back afterwards, I can click <Back>, then as soon as the redirect page returns, <Back> again. Now I would be at the reply window where I typed my post. One more <Back> takes me to the page I read before posting (which now carries my post), and since I'm done with this topic now, I click <Back> again to take me out to the Index of the Board my topic was on. If I click <Back> one more time, I'm out to the Main Board Index. If I kept going, eventually I would get to the page my browser opens to. At this point, I would no longer be able to click <Back>, because I'm at the end. The browser remembers this, and the <Back> button is "greyed-out". If you click <Back>, and realize you didn't want to do that, you can click <Forward> to undo it, so there's no risk.
Chowhound is a site where you have to use your <Back> button a lot, as they don't have links to get you everywhere you may have been before. Try opening the "Hot Posts" window, then after the Index appears, click on a post. It opens as a new window, which you can close (X in the upper right corner of your screen) when you're done. At any time, you can close the current window and return to the Hot Posts Index, regardless of how many posts you have followed.
As I said, this is confusing, you'll have to try these for a while before you start to get a feel for what they can do for you.