How can I remove duplicate content & titles from my site?

[ZoeAlexander]

Without knowing I created multiple URLs to the same page destinations on my website. My ranking is poor and I need to fix this problem quickly. My web host doesn't understand the problem!!! How can I use canonical tags? Can somebody help, please.

[eli.boda]

what cms are you using?

[ZoeAlexander]

Hi Eliathah, sorry for the delay! Been a bit mad recently! I am using a modified Zen Cart CMS that my webhost modified from an original template I believe. I have in the meantime been removing duplicate titles and content where possible. I have canonicals in place on every site page according to my webhost. How long do you think it will take Google to see the corrections? I have in the last 2 weeks gone from page 20 to page 11 for a couple of my main keywords.