Canonical where there is no option?

Hi guys!

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Hope you can help me with my problem. Had a blog on a free web service with several posts. I made a portfolio + blog page on a legit domain where i copied my ex posts.

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Here is the problem. On the free service blog i can't use canonical on each post because there is no option for it. I can go to it's source code but that's the all around code what every post uses.

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Can i use canonical on these posts what points to my newly made page's index? I don't want to delete my ex blog because it rank's for several terms.