I haven't seen the campaign manager for couple of days already, no instruction on how to claim the bounty someone else provided us what to do and no go signal if we can remove our signature. They should start communicating with us before people gets wild.
I think there was already an instruction on how to claim the bounty, you just have to fill up the form.
However, you are correct that there is no announcement yet whether you are free to remove signatures yet, maybe they are still in the process of counting posts.