The first thing you need to do is get a proper cleaning product sold at pet stores designed to remove all traces of the urine scent from your furniture. Whilst the scent is still there, your dog will continue to urinate on the furniture. Then, you need to take your dog outside regularly. As soon as s/he urinates (and I mean immediately!) give him/her a lot of excited verbal praise, and some other kind of treat (e.g. a dog biscuit). You need to be patient and keep this up, and before long your dog will stop urinating indoors.