Step 1:
Open your browser and log in to Yandex Mail. In the top right, click the Settings cog and then click the Personal data, signature, picture button.

Step 2:
Near the middle of the screen, click on the yellow Add signature button.

Step 3:
Paste your email signature into the provided text box. Once done, click the Add signature button.

Step 4:
Your new email signature is now installed! Test it out by composing a new email to make sure it looks correct.

Yes! Now it worked!
Hi there,
Have you experienced any problem of using the created signature on mobile?
It works from computer not from mobile!