How does an external SharePoint user update his profile?

I am on the O365 government and I want to manage the internal and external users of the same list. I do not own the site collection and create sites (subsites of the collection). I just found the discussion below that "user profiles are not supported by external users". I have invited myself to my external site and I do not see how to update my profile. As shown below, there is no option to update. Please help

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