How can I make a proxy contract on BSC Test Net?

Support Upgrades
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Hi @hasan_valipour, welcome to Open Zeppelin!

Please follow the tutorial for this at OpenZeppelin Upgrades: Step by Step Tutorial for Hardhat

But the only difference is that you will use the BSC Test Net instead of other networks.

This designation is found in your hardhat configuration files. You can check out hardhat tutorials in specific over at https://hardhat.org/tutorial/