First of all, you have to go to the page indicated below.

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Then, you will see the STAKING page (If you have $BBS staked, they automatically migrate to $RTB, so you don't have to do anything). In my case, I have the $BBS in my wallet, so I have to migrate them manually (I would like to know until when we have time to do it, since the fees, as I am going to show, are high as always in ETH and I have to analyze where I will get money to pay them and not run the risk of losing my $BBS or something like that... I think there is very little information about it!)

Now on this staking page, we will connect our wallet, I am using METAMASK. Then, that message appears about "migrate your BBS" and the button to perform the action.

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Once our wallet is opened to sign permissions and we get to the part of making the transaction, the BLESSED FEES of ETH and its mother kjfeqfuhefheldkwed appear.

As you will see in the image, about $8 AMERICAN DOLLARS. 

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For me, who lives in Argentina, it is a lot of money... So I have to analyze very well when to do the migration and that is why I insist that we need more information, to know if there is a deadline to do the migration!