Download MathWallet：https://mathwallet.org
- Switch to Kusama wallet
2. Enter【DApp】-【Kusama Auction Tool】
3. Choose the project participating in crowdloan
4. Check rewards information, type the amount, click Contribute, authorize signature to finish the steps.
New user could join in MathWallet Cloud Wallet，steps：
How to participate in Kusama Crowdloan in Cloud Wallet?