Creating a New DOT Account
While there are several wallets that support Polkadot, we've found that the Polkadot.{js} browser extension best serves most desktop users and the Polkawallet mobile app best serves most mobile users. Follow the guides below based on your wallet preference.

Option 1: Creating a wallet through Polkadot{.js} browser extension

1) Go here to download the browser plugin. The browser plugin is available for both Google Chrome (and Chromium based browsers like Brave) and FireFox.
This browser extension does one thing: it manages accounts and allows the signing of transactions with those accounts. It does not perform wallet functions, like sending or receiving, or show you wallet balances. After setting up your Polkadot.js browser plugin, you can use the Polkadot.js Apps website to check balances, transfer DOT, and more. Once you install the Browser plugin, be sure to pin it to your toolbar:
2) Open the Polkadot{.js} browser extension by clicking the logo on the top bar of your browser. You will see a browser popup not unlike the one below. Click the big plus button or select Create new account from the small plus icon in the top right. The Polkadot{.js} plugin will then use system randomness to make a new seed for you and display it to you in the form of twelve words.
3) You should back up these words as explained here on the Polkadot wiki. It is imperative to store the seed somewhere safe, secret, and secure. If you cannot access your account via Polkadot.js for some reason, you can re-enter your seed through the Add account menu by selecting Import account from pre-existing seed.
4) Name your account and choose a password. The password will be used to encrypt this account's information. You will need to re-enter it when using the account for any kind of outgoing transaction or when using it to sign a message. Click Next step.
Note that this password does NOT protect your seed phrase. If someone knows the twelve words in your mnemonic seed, they still have control over your account even if they do not know the password.
Do not ever share your seed phrase or password.
Keep "Network" as "Allow use on any chain." Click the account with the generated seed.
5) You’ve successfully created an account. To see your Polkadot address, you can change the visual display of how your address appears. Click on the gear icon in the upper right corner. Under the dropdown menu for “DISPLAY ADDRESS FORMAT FOR,” select Polkadot Relay Chain.
6) Your address is now in the Polkadot display format and you can see your Polkadot address. Polkadot addresses always begin with the number 1.

Option 2: Creating a wallet through Polkawallet

1) Download the Polkawallet app through the Apple App Store for iOS devices or Google Play for Android devices.
2) Click Create Account.
3) A new screen will appear explaining the importance of recording your mnemonic phrase in a safe place. Click Next.
4) Your mnemonic phrase will appear. Write the mnemonic on a piece of paper and store it somewhere safe. Click Next.
5) Confirm your mnemonic by entering the words in the correct order. Click Next when completed.
6) Name your account and create a strong password (at least 6 characters). Click Next when completed.
7) Your wallet is now set up. You can see your Polkadot address which begins with the number 1. To see your full DOT address or to copy the address, click on the three lines in the upper right corner.
8) You can now see your full DOT address and send your DOT tokens to this address.
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Option 1: Creating a wallet through Polkadot{.js} browser extension
Option 2: Creating a wallet through Polkawallet