Option_1: Vote yourself. alice votes for thebob validator and allocates 50 CYBER tokens for it:
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$ cleos system voteproducer prods alice bob "50.0000 CYBER"
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Option_2: Vote via a proxy account. If you are unable to vote, you can entrust your vote to a proxy account that will vote for you. To do this, you need to delegate the staked tokens to a proxy account.
alice delegates 50 CYBER tokens to bob that is a proxy account:
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$ cleos system voteproducer prods alice bob "50.0000 CYBER"