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I also do not understand, where to do this:

"Register Your Public Key

At any time a user can map their Etheruem address to a public key in one of the following formats:

EOS Public Keys - EOS4yfYEjUodfs.......DfavaddbvD
Steem Public Keys - STM4yfYEjUoey4.......UaSt2Sx9W4
BitShares Public Keys - BTS5WaszCsqVN9.......Wz47B3wUqa"