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Below is the following command used:

update_witness "klye" "https://steemit.com/witness-category/@klye/klye-s-witness-campaign" "STM6fsCZaUkydVUUDsJiyYvdWx1sg4XHpmVAFJvwHC8NFAQ58NqPa" {"account_creation_fee":"31.337 STEEM","maximum_block_size":65536,"sbd_interest_rate":500} true

The part "sbd_interest_rate" is what you'll want here.

The update_witness command from within the cli_wallet is used above.

Replace the KLYE info with your own and you should be good. :)

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