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How can I do that?

If you use Peakd, you can hit the 3 dots by the number of comments:

Screen Shot 20200404 at 9.09.44 AM.png

then select the GiftGiver community since you are already subscribed and post and then you should be good.

Screen Shot 20200404 at 9.10.32 AM.png

OK, thanks! I'll do it now!