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@melinda010100 Can you guide me how to add gif file on ecency?

I'm not sure what you mean. The link to the github media codes is in my contest post, and there are some Ecency art/banners in the Ecency Discord in the #ecency-gallery room.

https://discord.gg/pwyqTZkUUh

One more question, if we create a community then either we can set permissions from the admin to join the community like facebook private group?

I don't use Facebook, but if you create a community and share the community link with your friends they will be able to join.

If you have already created a gif for the contest, you would add it the same way that you add a photo by clicking on the photo icon square in the editor. Let me know if you need more help with this!