Hi, Thanks for submitting tabs. No, it's not possible to edit an artist yet. But it will soon, in the next few months (especially to allow members to submit their own songs).
At the moment if you add a new artist, several checks are automatically run in background. If we can't find any info, it is flagged as "unknown", and a member of our team will manually check what's going on.
Then we either delete or edit artist infos. hope this helps!