Please see the following threads, they will contain a lot of information on what you want to do:
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https://vborg.vbsupport.ru/showthrea...ister+external
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https://vborg.vbsupport.ru/showthrea...t=registration
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https://vborg.vbsupport.ru/showthrea...t=registration
Also do a search on 'salt' that will give you information on the password hashing used in vB.
PS If you have the skills but not the time, and you want someone to spell things out for you, you might be better off posting a Service Request and pay someone to do the job for you.