Visit pooltool.io and enter your owner public key and pool id witness data in the metadata section.
Find your pool id witness with the following command.
cat stakepoolid.sig
Find your owner public key in the file you generated on ITN. This data might be stored in a file ending in .pub
Finally, update your stake pool information with the PoolTool-generated metadata-url and metadata-hash. Notice the metadata has an "extended" field that proves your ticker ownership since ITN.