all the files for the template have to end up in the template subdirectory of your forum. eg: "www.example.com/forum/templates/subMerged
" the subdirs of subMerged should be admin, images, fla. There should be stuff like bbcode.tpl, index_body.tpl in the subMerged dir. You probably are going to have to use a FTP client like SmartFTP, or internet explorer 6 (MS Firefox v7 cut out ftp support and now functions just like firefox). FYI: Knowledge base is the best place to look for first. Here
is an article about installing themes.
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I would heartily recommend reading through the Knowledge Base
. I recently have and it has solved a number of questions I had.
EasyMod is great for a vanilla phpBB. Visit my website and see why I do everything by hand.