利用福昕PDF阅读器在PDF上写字。
1、首先上网搜索并下载“福昕PDF阅读器”。下载完成后，直接运行安装程序，待安装完成后，就会自动与PDF文件类型进行关联。
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2、接着用PDF打开要修改的pdf文件，切换至“COMMENT"（标注）选项卡，然后就可以利用相关工具对pdf文档进行修改操作啦。
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3、我们选择”文本标记“选项里的”高亮标记“按钮，就可以对文件中的内容进行类似于水彩笔似的标记啦。
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4、选择”文本书写“按钮。
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5、然后在需要输入文件的地方点击即可进行文字的输入操作。
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6、我们还可以利用”绘图“选项中的相关工具，对文档内容进行标注。