> For the complete documentation index, see [llms.txt](https://docs.signius.eu/manuals/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.signius.eu/manuals/harmony-desktop-en/signing/xml-documents-xades-in-securedoc.md).
# XML Documents (XAdES in SECUREDOC)
1. Open SecureDoc app.
2. Choose XAdES fromat in the "Signing" tab.
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4. To add a timestamp, go to "Settings" tab, click "Timestamp Settings" and enter a timestamp server address your username and password. Alternatively you cen select a variant without a timestamp.
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7. Add the file(s) by clicking "Add File" in the "Signing" Tab.
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9. Select your file(s) and click "Sign files".
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11. Click "Personal certificates", select your certificate and click OK. If you can't see uour certificate make sure, that Harmony Desktop is running and click "Refresh".
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13. Enter your OTP code (SMS token). This might show up two times.
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15. After that your document will be signed. On SIGNIUS Professional platform the amount of qulalified signatures will be reduced by the number of signed documents.
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17. If you click "Show document", it will open in the system's editor. Signature is located at the ent of the document.
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