If you have the difficulty in opening the pdf file, here is the summary of steps without screenshots.
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Go to https://orcid.org and click “Sign in”
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Login with your registered email and password to ORCID.
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For those articles that have DOI link (URL usually starts with http://dx.doi.org/), Click “Search & link”à Click “CrossRef Metadata Search”à Click “Authorize”
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Search your articles with DOI. If you find your articles, click “ADD TO ORCID”.
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For those articles without DOI links, you can add the works manually. Click “Add Manually”, and fill in the form for each publication and click “Add to list.”