开通蚂蚁花呗的方法步骤如下：

第一步：进入支付宝界面之后，点击最下方的“我的”。

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第二步：进入“我的”界面之后往下滑动，找到并点击“花呗”。

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第三步：然后就可以点击屏幕中间的“同意协议并开通花呗“。

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第四步：然后会有输入密码的提示，输入密码即可。

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第五步：成功开通后就会有提示，点击上方的完成即可。

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