在网上预约挂号专家门诊的具体步骤如下：
准备的材料分别是：手机、微信。
1、首先，我们打开微信，然后点击支付中的“城市服务”，如下图所示。
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2、接下来，点击弹出窗口，在注册平台中打开“预约挂号”，如下图所示。
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3、然后，我们在弹出来的窗口中点击选择想要挂号的医院，如下图所示。
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4、接下来，在弹出窗口中，单击并选择要注册的门诊部，如下图所示。
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5、最后，在弹出的窗口中，我们就可以选择预约的医生和正确的时间，如下图所示。
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