Hi @s4ns,
every User which has an account has an Id.
You can access that by using the User-Object with Jquery User().id.
Create a form with which you want to create the record.
Populate those 2 fields with the needed data. Have a look at that tutorial how to populate a lookup field: https://www.youtube.com/watch?v=N7p-EfwshAg
Hide the two fields, as your user probably shall not see those.
After submitting your lookup fields will be populated with the correct user.
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Hope that helps.
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