Delegation in Cardano do not require from you to send the coins (ADA) anywhere. You can delegate through official wallets like Daedalus and Yoroi (browser applet). Those wallets provide you a list of active staking pools, you just pick one and click "delegate". This is something like a "promise" of supporting particular pool, not an actual transfer. So you can use your coins any moment you want. Don't ever fall for scams asking you to send any transaction with ADA!
Thank you for this very informative insight.
As long as it's not an official partner or there's no announcement from ADA that they're allowing this arthur goldman or whatsoever third-party for their staking, it's not for real and much better to keep away from it.
Based from adapools.org/relay, this is more of a cloud staking. And I would assume that it's like the other suspicious and scam cloud mining that are existing.