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I don't see a place to enter the invite code?

Sorry, I don't use boinc manager for adding accounts, I do it through BAM.

You should be able to add the account on the yafu website though, just remember to use the same sign-up details as your other projects.

https://yafu.myfirewall.org/yafu/create_account_form.php

You're right, I was able to create an account through the website. Thanks a ton!!