I lost the remote and cant change my speaker settings on my coby dvd 915

Unfortunately, you'll need a new remote. Try a universal if you have one. If not, might just buy a new remote. eBay has a bunch listed cheap enough. Just search the model number of the remote for your system. I was able to find this remote, although $20, a universal MAY work and cost less. make sure you can return any universal you do buy in case you can't return it. Although for the dvd-925 system, the remote looks exactly like the one show in the manual for you dvd-915 model. Hope this helps.

http://cgi.ebay.com/COBY-DVD-925-REMOTE-CONTROL-/120691246947?pt=LH_DefaultDomain_0&hash=item1c19c24763