Install required peer dependencies:

npm install @dfinity/agent @dfinity/candid @dfinity/principal

Install th package itself:

npm install @bitfinity-network/bitfinitywallet 

After installation your editor will show you typehints for various wallet methods. Please check the docs here: https://infinityswap-docs-wallet.web.app/docs/wallet.

For example try:

await window.ic.infinityWallet.requestConnect({
  whitelist: ['ryjl3-tyaaa-aaaaa-aaaba-cai']
});