Sorry for the necromancy, just in case someone finds this thread, following the ancient answer on TMO I can’t find right now, manually adding an XMPP contact can be done using the People .vcf import.
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Create a vcf file like:
BEGIN:VCARD VERSION:2.1 N:Example Jabber Contact;;;; FN:Example Jabber Contact X-JABBER:username@jabber.example.org END:VCARD
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Save it to
${HOME}/Documents
(NB: in sandboxed-enabled SFOS versions, People can not access $HOME or Downloads, causing the import to fail. Do use Documents) -
Launch the Settings app
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Go to Apps->People
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Select “import from contact file”
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Select .vcf file to import
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Close Settings and People
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Open People
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Search for your new contact and link it to the proper contact in your addressbook.