2.1 From the electronic headquarters
You can access the “Service for processing form 036 (WEB Census) for individuals (Initial registration, Deregistration or Change of address) through the Electronic Headquarters of the Tax Agency, in the sections:
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Home >All procedures > Censuses, NIF and tax domicile > Censuses > Form 036. Census of entrepreneurs, professionals and withholding agents - Census declaration of registration, modification and deregistration. > Procedures for individuals (WEB Censuses) > “Service for processing form 036 (WEB Censuses) for individuals (Initial registration, Deregistration or Change of address)”.

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Home > Information and procedures > Censuses, Tax Identification Number and tax domicile > Procedures for individuals (WEB Censuses) > "Service for processing form 036 (WEB Censuses) for individuals (Initial registration, Deregistration or Change of address)"

Additionally, in each of the subchapters that follow within the chapter "Census procedures related to entrepreneurs, professionals and withholding agents (Form 036)", corresponding to the topic "Census, NIF and tax domicile".
You can also find it through the Headquarters search engine by entering the keywords: “Service for processing form 036 (WEB Census) for individuals (Initial registration, Deregistration or Change of address)”.