[Question]GnuPG cannot verify simplewall

[KMA6615]

Hi, tried to use the .sig file to verify simplewall using GnuPG, but it did not go well:

Dgpg: Signature made 08/09/25 14:01:20 W. Europe Summer Time
gpg: using RSA key D98523611524AB29BE7330AC288120A75635B5FD
gpg: Good signature from "henrypp sforce5@mail.ru" [unknown]
gpg: Signature notation: manu=2,2.5+1.11,2,1
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: D985 2361 1524 AB29 BE73 30AC 2881 20A7 5635 B5F

Could be I've misunderstood, as this is the first time I've tried to use GnuPG.

App version: 3.8.7
Windows version: Win10x64