Pretty Links is a plugin, so you find and install it like any other plugin:

Search for the Plugin

Install the Plugin

Click on the Install Now button and wait a few seconds for the plugin to install.

Activate the Plugin

Once the plugin has installed, click on Activate.

New Pretty Links Menu Item

Pretty Links will then appear as a WordPress menu item and you can convert as many internal or external links as you like.

Add New Pretty Link

To create a new Pretty Link, click on Add New, either from the Pretty Links page or from the WordPress menu.

You can give the new Pretty Link a title, but if you don’t it will often derive one from the URL being linked to. The title is only used for you to recognize the various links once you have a few.

Enter the target URL. This will be your vendor’s affiliate link.

The Pretty Link is already shown, comprising your website’s URL, followed by a / and 4 letters or numbers.

Click the Update button to create the Pretty Link. The button label will change to “Publish” briefly.

Using the Pretty Link

After you Publish the Pretty Link, it will appear in a list of links.

Click on the copy icon next to any Pretty Link in the list.

You can then Paste it wherever you need to link to your vendor via your affiliate link.