update readme

Signed-off-by: pengzhile <pengzhile@gmail.com>

README.md

@@ -2,7 +2,7 @@
 
 1. Download and install plugin from [Release Page](https://gitee.com/pengzhile/ide-eval-resetter/attach_files/518314/download/ide-eval-resetter-2.1.1.zip).
     * Alternative installation method: 
-        * Add "Custom Plugin Repository": `https://plugins.zhile.io` manually
+        * Add "Custom Plugin Repository": `https://plugins.zhile.io` manually (`Settings/Preferences` -> `Plugins`)
         * Search and install plugin: `IDE Eval Reset`
 2. Click `Help` or `Get Help` -> `Eval Reset` menu.
 3. Click `Reset` -> `Yes` button.