You can swap both DCN and ETH from Mainnet to Optimism via Dentacoin Wallet - SWAP feature. It is the most cost effective option (3 - 4$). 

 

You can purchase ETH on Optimism directly from Dentacoin Wallet: wallet.dentacoin.com/buy or through  an exchange.

 

 

 

Confirm that you have DCN and ETH on Optimism network. Open Metamask, switch to “Optimism network” and check the balance:

 

 

 

 

 

 

Click STAKE NOW button to connect your wallet.

 

 

 

Choose the method to connect your wallet:

 

 

Confirm the connection in your wallet application. If you are using WalletConnect, make sure you switch to the right network, Optimism when connecting your wallet:

 

 

 

After successfully connection your wallet, it is time to stake. This a 2 step process and you need around 2$ in ETH on Optimism to complete both transactions:

 

APPROVE - to allow the staking contract to interact with your STAKE NOW button to connect your wallet.

 

 

STAKE - to place your actual stake in the pool.

 

 

 

Each step should be confirmed by you in your wallet.