add gpg change key password

active/software_gpg/gpg.md

@@ -4,6 +4,7 @@
   - [Searching for GPG Keys](#searching-for-gpg-keys)
   - [Importing GPG Keys](#importing-gpg-keys)
   - [Generate GPG Keys](#generate-gpg-keys)
+  - [Change Key Password](#change-key-password)
   - [Renewing GPG Keys](#renewing-gpg-keys)
   - [Export GPG Keys](#export-gpg-keys)
   - [GPG Key Servers](#gpg-key-servers)
@@ -62,6 +63,18 @@ gpg --list-secret-keys
 gpg --edit-key <id>
 ```
 
+## Change Key Password
+
+```bash
+# You can see all the --edit-key options with `man gpg` and search for '--edit-key'
+# You can also type "?" to see help
+gpg --edit-key 7FC1B29700114F4FC589E7065FDDCFA544D77B8C
+
+> passwd
+
+> quit
+```
+
 ## Renewing GPG Keys
 
 You should set an expiration for your keys. You can extend that expiration (or