I've developed my own Wordpress theme and I wanted to give users the ability to subscribe to my blog.
I have the typical Post RSS and Comment RSS options that come with Wordpress under the META section of the sidebar, but I also wanted to give my readers an option to just input their email address and press a button to "subscribe".
I know this is possible since I've seen many many blogs that use this, and if needed I can list some here. But I'm not sure if this is a plugin or a widget or what-have-you.
If you know how to implement this functionality into a Wordpress theme please let me know.
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You shouldn't add such code into your theme; this is really a plugin job, and your users may choose another one than yours..
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When i wanna add a new functionality to my WP sites, i always start by googling plugins.
I mean if the solution already exists, that means less work for me, right? ;).
This will open a popup to your visitor for subscriber https://wordpress.org/plugins/sc-popup-subscriber-form/.