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"