We go to the BSCScan official blog website and click on the ADD BSC Network button at the bottom left of the website and accept the warnings on metmask.
Thus, the BSC Network network will be added to your metamask.

If the first method does not work, you can manually add the BSC Network by selecting the add network via metamask option as the second method.

After adding the BSC Network, we enter the Aztec Protocol contract address into the custom token tab from the import tokens tab, paste it into the section that says Token contract address, and add it to our Aztec Protocol metamask.

Aztec Protocol contract : 0x2fb96f931211dc096fccd5f3511d677f3318ea72

After the Aztec Protocol metamask appears in your account, send the BNB equivalent to the Presale Address for how many Aztec Protocols you want to buy.

Presale Address : 0xAA129134F1F0fb051fae487f3a92481808BD83b6