I have verified my email but I can't subscribe to anyone and I can't figure it out.
Click on the persons name not heir intractable, press follow, and it automatically works. If it doesn't, try using another device (download the instructables app)
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Be certain that you are using Firefox as your browser. Some of the features will not work in other browsers.
When you say "can't", do you get any sort of message? Does the button react when you click it?
Report it as a bug in the so named forum.
Last such a bug took months to be resolved, which should not be disturbing to anyone of your age.