Heyy I can't add a tag when I'm reading manga on mob.. How do I aad a tag ?

you need to press enter, but for some reason it haven't been working using the keyboard (it used to be). so now i paste the enter (do it from notes or smth), keep it in my clipboard, and paste it from there

I remember I could add tags even with my mobile but now it doesn't work.. I have to use laptop to add them..