Royalties for your tokens/contract can be set on Etherscan.
To do this, head over to your Contract's page.
Click the 'Contract' tab > Click 'Write as Proxy'
Scroll down to functions 29/30
To set royalties out you will fill out either 29/30.
29. setRoyalties - This allows you to set royalties at the token level
30. setRoyalties - This allows you to set royalties at the contract level
To input the values:
For token royalties, add the TokenID
Receivers - Address that the royalties will go to. For multiple, please separate with a comma
Example: ["0x111"]
BasisPoints - The amount of royalties that will be sent to the Receivers
Ex. 1% = [100], 10% = [1000]
*Please remember to connect to Web3 before Writing this transaction