Hello. If my Deadalus will be online from more than one PC, it will somehow affect the generation of blocks.
No - accessing a wallet has got nothing to do with generation of blocks (not that your daedalus node is
generating blocks in any case) - its perfectly fine to have it running from multiple machines, please check out information regarding wallets here.
Ok. I have a Deadalus wallet, I have ADA on its balance. My wallet is online. What next is needed for the Proof of stake?
Since its a seperate question - please create a new thread in future if your current query was answered and you’re following up with new one.
To answer it this time - You need to wait for shelley to be released on mainnet to participate in staking on mainnet , dates available here