I have all my credits for Challenge registered.

Now, I would like to do same thing for Iota, however i am bit confused how to do it because i have qso Granted/validate for challenge and need same qso for iota, how can i do it?
Perhaps a crazy question, but in fact i have tried some approaches but i am not doing the right thing.

In case you done it, could you please comment?
Thanks in advance for your help.