Yandex Webmaster Tools lets you check your site for twenty common mistakes, find and solve your basic site problems, and then review your full diagnostic history to enhance your site's SEO performance.
To connect your website to Yandex Webmaster Tools:
Go to https://webmaster.yandex.com/welcome and click Log in, or make an account with Yandex Webmaster Tools.
Once you sign in, click on Go to get started.
On the page that opens, under My Sites, click Add site.
In the Site address field, add your website's address link (e.g. https://www.mywebsite.com)
Yandex will ask you to add the HTML Tag to your website. This is the verification method for your SITE123 website. Copy the code.
Go to your Website Editor, click Settings, and select Plugins from the drop-down list. Click Manage, then Add New Plugin and add Yandex Webmaster Tools.
In the Application ID field, enter the code snippet from the HTML Tag you got from Yandex Webmaster Tools. Insert the code, Enable it, and click Save.
Publish your website to update it with the changes you've made.
Once you Publish the website, go back to Yandex Webmaster Tools and click the Check button to see if your tag was added to the website.
If the process was done correctly, you will be redirected to a new page with the rights of the website. This will complete the verification of your website with Yandex Webmaster Tools.