Glad moving the speakers helped a bit.
I believe to add the build link to your signature open your build thread, copy the WWW. address in your browser top line, then on your profile go into "Edit Signature". It will open up an edit window. In the icons above is the symbol of a linked chain. Click on it to insert a link then just paste into the URL box.
I think that should do it. It has been a while.
Had my theater build linked for awhile but I'm in the process of changing things so deleted the thread.
Enjoy your new theater. My family uses ours daily.