Here is the simplest way to verify your Google webmaster tool with your wordpress site
Step 1: Login in your webmaster tool account and add your URL
Step 2： Verify your URL via Meta tag. Please refer to the pictures as follows:
Choose Alternate method which is at the right side of Recommend method button
Choose HTML tag
Copy Meta tag code into your WordPress site
Open WordPress site dashboard and find Edit option which is in the Appearance tag.
Open Editor and find header.php
Copy Meta tag code to header. php
Click Update and go back to Google webmaster tool interface
Step3: click Verify and check to see if it works properly.
Please let me know your verifying experience. You feedback is mostly welcome!