Noted That:

• To install correctly this relative-menu-item.zip.
• Fisrt Download the relative-menu-item.zip to your computer
• Extract/Open relative-menu-item.zip to Your Computer.
• Then, Find readme.txt file inside relative-menu-item.zip and Open readme.txt.
• Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
• Then, Follow the the Tips Below.

Start the Tips:

1. First Download "relative-menu-item.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "relative-menu-item.zip" Downloaded plugin from your computer, Where you downloaded relative-menu-item.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Relative Menu Item Plugin" folder is added on left sidemenu. Now, Click on "Relative Menu Item Plugin" folder.

   Noted that: If you do not see "Relative Menu Item Plugin" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Relative Menu Item Plugin Configurtions and Settings or How to work "Relative Menu Item Plugin" in your WordPress site.

After Activated Plugin According to Step-6 then,

1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
2. or Direct go to: https://yourdomain/wp-admin/plugins.php
3. Then, Find "Relative Menu Item Plugin" Activated Plugin from Plugin List.
4. Then, Click on "Settings" from Plugin that is Relative Menu Item Plugin
5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Check out the official installation guide. It’s totally more awesome than anything I’d be bothered to write here. Plus, wordpress codex is your friend. (Mostly).