You set your avatar and banner on the General tab of the profile editor in the ENS App.
Open a name you own and select Edit Profile. A name you haven't upgraded to ENSv2 can't be edited in the ENS App.
On the General tab, select Add a profile picture for your avatar, or Add a banner image for your banner.
For your avatar, select Upload image to pick a JPG, PNG, GIF, WebP, AVIF, BMP or ICO file under 3MB, or Enter manually to paste a link to an image.
If you upload a file, sign the message in your wallet. It proves the upload is yours and costs no gas.
Select Preview, then Publish changes, and approve in your wallet.
Saving is a transaction, so you need a little ETH for network fees (gas).
For your theme colour, an NFT avatar and the rest of your profile, see Edit your ENS profile.

