Josh? The start page seems to be hit or miss for me, or maybe I'm just offline when I see the start page every time and I don't realize it, but, whatever the case, if you're online and MC knows you're online, there's a link to the interact forum on the online page that loads. It's only one more step after that to get to this specific support board. I managed to change the offline start page, but I couldn't figure out how to prevent it from going to the online page. If you want to know how to do that and to go from there, there's two ways.
First is just a meat and potatoes forward. Edit the index.htm file in Notepad under c:\(mc10 directory)\Data\Default InetPage\, delete everything and replace it with:
<HTML>
<META HTTP-EQUIV="Refresh" CONTENT="0;
URL=http://yabb.jriver.com/interact/index.php?board=3">
</HTML>
The zero means it will forward immediately, no delay.
The other way is just to insert code into the existing page with a link to the support forum. I did it so it looks all nice by inserting this code in the right place:
<tr>
<td width="10" valign="middle"><img src="arrow.gif" border="0" width="10" height="11" alt=""></td>
<td class="content" valign="middle">
JRiver Media Center Support Forum</td>
</tr>
I put it before the <tr> for the one that says "Importing files". Search for the word "importing", not "importing files" because they're on separate lines. That's all I know. And like KingSparta says, it'll get overwritten every time you upgrade.