Click the connect your wallet button on the top right
Click _add to Metamask _ button
If Metamask is well connected the fox icon appears.
Add the Polygon network to Metamask using chainlist.org
Deposit at least 0.2 MATIC to your Polygon wallet.
What is $MATIC?
$MATIC is the currency used on Polygon to pay for transaction fees and, consequently, for deploying a DAO, in the same way that ETH is used on Ethereum.
Where can I get $MATIC?
$MATIC can be bought on a decentralized exchange such as UniSwap, using $ETH or any other ERC20 token. Then $MATIC needs to be transferred onto the Polygon network using a 'bridge' such as https://wallet.matic.network/bridge.
Alternatively, $MATIC can be bought from a centralized exchange, such as Binance or Kucoin and then sent directly to your Polygon wallet.
How much $MATIC is necessary to deploy a DAO?
At least 0.2 $MATIC is required to deploy an Aragon DAO, though the actual cost might be more or less (depending on the network traffic). You can estimate the necessary gas price here.