You can search them on mostr.pub without the @ at the beginning and it should give you a link to their corresponding npub.
https://njump.me/nprofile1qqsddtz3rstm8da0qup9xzp8kz2cwlx906t5t2tlpmg4nqp09p72z8cpz4mhxue69uhhyetvv9ujumt0wd68ytnsw43qcufsca
Then you can just copy and follow: nostr:npub166k9z8qhkwm67pcz2vyz0vy4sa7v2l5hgk5h7rk3txqz72ru5y0snj4e22
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How did you find the npub ?
Sorry I’ve just seen your previous reply. Thanks 🫂💜
Start here. You just need to paste in their Mastodon handle.
https://mostr.pub
