I was confused on how to vote up an idea. I think that it should say that voting is adding a kudos on the main Ideas page and now in the frequently asked question.
From Frequently asked questions:
"Interacting with Ideas
How do I vote for an idea?
After reviewing an idea, you may decide to cast your vote of support. ArcGIS Ideas uses a system of kudos to measure votes, which works similarly across the Esri Community. Kudos can be seen at the bottom of each idea post, like below:
By clicking on the thumbs up button, you will cast your vote, increasing the total kudo tally by one. If you wish to revoke a kudo you’ve given, click on the thumbs up button again. Note that you are unable to give kudos to your own idea posts. In addition, some idea statuses will freeze an idea from receiving further kudos. For more information, see Why am I unable to kudo some ideas?"
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