To create a Metamask wallet, please visit the Metamask website. Beware of fake Metamask and use only the official website! -> https://metamask.io/
Metamask supports the Astar network and allows users to transfer tokens and sign transactions. More details are in Astar's documentation.
Configure Astar Network
When you connect Metamask to Algem dApp, Algem will automatically change the Metamask configuration to Astar Network. Still, if you need to add the network manually, you can find the configuration below.