According to your link you only need to place the message and signature to verify it's signed (but that doesn't guarentee it's the correct wallet unless you do some digging deeper)
No, the link is not saying that I only have to input the Signature and the Message. First, you have to go https://slowli.github.io/bech32-buffer/ where you need to decode bc1 address to binary data (in hex), then you have to go https://bitcoinvalued.com/tools.php where you convert the binary data to bitcoin address which is started with 1. Then copy the bitcoin address and try to verify it in brain wallet or other sites which has these services. 