# Wallet creation and configuration
UNO — is a decentralized service which works via smart contracts (web3) technology, thus, to use it you should have an Ethereum cryptocurrency wallet supporting operations with web3. As such a solution, we recommend using a [Metamask](https://metamask.io/) wallet.
### Metamask installation
Go to the official website of the wallet [https://metamask.io/download](https://metamask.io/download/)
Install the browser version of the wallet.
At the time of this writing, Metamask supports 4 types of browsers. This instruction is made for Google Chrome browser users.
###
### Creation of the Ethereum wallet
Metamask has been installed, now we need to create a cryptocurrency wallet
Click "Create a Wallet" and follow the instructions
Enter a password which you will never forget. It will be used for unlocking of your wallet:
**Carefully** read the following page:
Remember that careless usage and storage of the secret phrase may lead to a complete loss of funds. Before getting of the secret phrase we recommend to make sure the lack of malware on your computer which can steal the information while getting or storage. Also, we recommend storing the secret phrase on paper and not copying it to the clipboard.
Follow the instructions until the wallet is created
Congratulations! Your cryptocurrency wallet is created and ready to be configured.
### Metamask configuration
Since the main Ethereum blockchain is slow and expensive, alternative blockchains and L2 solutions have been created that speed up and reduce the cost of working with DeFi.
UNO is a cross-chain application that will work with both the main Ethereum blockchain and L2 solutions.
At the current stage of the protocol development, public version of UNO supports Pilygon blockchain only. Money transfer to Polygon can be performed by several ways, the use of Binance Smart Chain (BSC) network is the most profitable of them. That's why we will describe below how to configure Metamask for use in the Polygon and BSC networks.
1. Open the Metamask extension in the upper right corner of your Google Chrome browser (you may first need to click on the "puzzle" icon to do this), expand the network selection drop-down list and click the button Add Network:\ 
2. Add Binance Smart Chain (BSC) network with the following network parameters:\
**Network Name:** Binance Smart Chain\
**New RPC URL:** \
**Chain ID:** 56\
**Currency Symbol:** BNB\
**Block Explorer URL:** \
3. Add Polygon network in the same way:\
**Network Name:** Polygon\
**New RPC URL:** \
**Chain ID:** 137\
**Currency Symbol:** MATIC\
**Block Explorer URL:** \
**Done!**\
\ **Congratulations! You've just created and configured the Metamask wallet.**
Now all that's left is to top it up. We will do this in the [next section](/tutorials/using-uno/wallet-top-up.md).
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