PuTTY Keys and Signatures

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Hi comp.security.ssh,

I need to use PuTTY, but it's all new to me.  Because I have Windows comput
ers and have heard of RSA, I've downloaded the PuTTY Windows installer exec
utable (http://the.earth.li/~sgtatham/putty/latest/x86/putty-0.65-installer
.exe) and RSA sig (http://the.earth.li/~sgtatham/putty/latest/x86/putty-0.6
5-installer.exe.RSA) from the PuTTY Downloads Page (http://www.chiark.green

I'm also new to sigs.  The above page refers to signatures and provides a l
ink to the PuTTY Downloads Keys and Signatures page (http://www.chiark.gree
nend.org.uk/~sgtatham/putty/keys.html).  I've gone to the latter page and f
ound out that the sets of RSA and DSA keys supplied on the page are compati
ble with GnuPG and PGP2.  Because the page provides a link to GnuPG and not
 to PGP2, and I have Windows and want to be simple and modern :), I've down
loaded the Windows simple installer for GnuPG modern (https://www.gnupg.org
/ftp/gcrypt/binary/gnupg-w32-2.1.7_20150811.exe) and sig (https://www.gnupg
.org/ftp/gcrypt/binary/gnupg-w32-2.1.7_20150811.exe.sig) from the GnuPG - D
ownloads page (https://www.gnupg.org/download/index.html ) and installed thi
s software.

As you can tell, I'm also new to GnuPG, but I've found out enough about it  
to execute the following command to verify the PuTTY installer:

gpg --verify putty-0.65-installer.exe.RSA putty-0.65-installer.exe

When I run the command, I get the following results:

gpg: Signture made 07/25/15 03:34:04 Pacific Daylight Time using RSA key ID
gpg: Can't check signature: No public key

I see that the PuTTY Downloads Keys and Signatures page provides three RSA  
public keys, but which one should I use and how do I tell gpg about it?  

Best regards,

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